Five Cent
FOREO LUNA 4
A silicone T-Sonic facial cleansing and firming-massage device with 16 intensities, a 600-use battery and a two-year warranty, in three skin-type variants
Scored on the published rubric, from documentation, pricing and verified user reports.
Best for: People who want a one-minute daily cleansing routine with a brush that is documented down to the hertz, that charges over USB a handful of times a year, and that carries a two-year warranty from a maker that posts the full manual online.
Verdict
The FOREO LUNA 4 is the best-documented facial cleansing device we have read a manual for: 100 Hz T-Sonic pulsations, 16 intensities split into Gentle, Regular and Deep bands, a 520 mAh battery rated for 600 one-minute uses on a two-hour charge, 122 grams, a 100 percent waterproof closure and a two-year limited warranty, all printed in the manual on foreo.com as of October 17, 2026. This is a documentation review. We read the LUNA collection page and the LUNA 4 manual; we did not run the device. Two gaps keep the grade down. FOREO's US-dollar price could not be read from our location, because foreo.com served Vietnam-region pricing and no country switch available to us changed it, so value is scored provisionally. And the headline clinical claims, 99 percent of dirt, oil and makeup removed and 35 times more hygienic than nylon brushes, cite third-party trials without a sample size or a link. The LUNA 4 is a well-built, well-documented brush; it is not a medical device and FOREO does not claim it is one.
Visit FOREO LUNA 4
We have no affiliate relationship with this vendor. Link goes to the official site.
Where it is strong
- The manual prints the numbers most brush makers skip: 100 Hz, 16 intensities, Li-ion 520 mAh 3.7 V battery, two-hour charge, up to 600 uses, 90-day standby, under 50 dB, 122 g, 82.5 by 38 by 102 mm (foreo.com manual, checked October 17, 2026)
- Three brush variants for balanced, sensitive and combination skin, with Gentle (1-5), Regular (6-10) and Deep (11-16) intensity bands
- Firming massage side with five massage patterns (Lymphatic Drainage, Deep Tissue, Trigger Point, Shiatsu, Reflexology) and four app-guided routines of two to four minutes
- Body-safe silicone and ABS construction, 100 percent waterproof closure, USB charging; FOREO's FAQ states it is safe to use while pregnant or breastfeeding
- Two-year limited warranty with registration through the app or foreo.com/product-registration
Where it falls short
- US-dollar list price could not be read from foreo.com on October 17, 2026; the site served Vietnam-region pricing (6,799,000 dong) regardless of every country parameter we set
- The 99 percent cleansing and 35 times more hygienic claims cite third-party clinical trials with no sample size, date or link on the page
- No IPX code is printed; FOREO says 100 percent waterproof closure, which is a description, not a rating
- The firming massage mode leans on the FOREO app for guided routines; manual massages run without it but the four guided programs do not
- FOREO's warranty page returned a 404 on October 17, 2026, so the two-year term rests on the manual alone and the 10-year quality guarantee FOREO advertises elsewhere could not be verified
At a glance
| Technology | T-Sonic pulsations through silicone touchpoints, 100 Hz |
|---|---|
| Intensity levels | 16 (Gentle 1-5, Regular 6-10, Deep 11-16) |
| Cleansing modes | 3 (Gentle, Regular, Deep) |
| Firming massage | 5 manual patterns; 4 app-guided routines of 2-4 minutes; 3 saveable to the device |
| Battery | Li-ion 520 mAh 3.7 V; 2-hour charge; up to 600 one-minute uses; 90-day standby |
| Charging | USB (cable in box per manual); do not use while charging |
| Water resistance | 100 percent waterproof closure (no IPX code printed) |
| Materials | Body-safe silicone and ABS plastic |
| Weight and size | 122 g; 82.5 x 38 x 102 mm |
| Noise | Under 50 dB |
| Warranty | 2-year limited warranty (manual); register via app or foreo.com |
| List price | US price not readable from foreo.com on October 17, 2026; Vietnam-region page showed 6,799,000 dong |
| Pricing note | foreo.com served our server Vietnam-region pricing of 6,799,000 dong on October 17, 2026; the US-dollar list price could not be read from the manufacturer's site, so this review does not print one |
What the FOREO LUNA 4 actually is
The LUNA 4 is a palm-sized silicone cleansing device with two working faces. The front carries silicone touchpoints driven by T-Sonic pulsations at 100 Hz for cleansing; the back is a smoother surface that runs lower-frequency pulses for what FOREO calls a firming massage.
It replaces a nylon-bristle brush, not a dermatologist. FOREO's pitch is hygiene and gentleness: silicone touchpoints are non-porous, so the brush does not hold bacteria the way bristles do, and the 16 intensity levels let sensitive skin run the device at a low setting.
FOREO sells three variants for balanced, sensitive and combination skin. The difference is in the touchpoints, not the motor; the manual's technical specifications apply to all three.
The LUNA 4 is not a medical device and FOREO does not claim it is. That matters when you compare it with the NuFACE Trinity+, which carries an FDA 510(k) number, or with an IPL like the Braun Silk-expert Pro 5. Different aisles, different rules.
Who the LUNA 4 is best for
FOREO's manual and collection page point to a specific user.
- People who want a one-minute daily cleanse with a timer that ends the session automatically
- Sensitive skin that needs the Gentle band (levels 1 to 5) rather than a fixed-speed brush
- Anyone who dislikes charging: 600 uses per two-hour charge is the longest battery figure we have read for a face device
- Travelers who want a device that is waterproof, under 125 grams and charges from any USB port
- Buyers who want the full manual before purchase; FOREO posts it, including battery chemistry and noise level
Who should skip it
Three groups should pause before buying.
- Anyone who needs a confirmed US price today; foreo.com did not show one from our location on October 17, 2026
- People expecting a regulatory claim; the LUNA 4 makes none and needs none, but if that is what you want, the microcurrent and IPL categories are where it lives
- Users who want every firming routine without a phone; the four guided programs are app-only
What the manual prints (and the collection page does not)
The collection page sells; the manual specifies. From the manual on foreo.com, checked October 17, 2026: body-safe silicone and ABS plastic; Li-ion 520 mAh 3.7 V battery; two-hour charge for up to 600 uses at one minute each; 90-day standby; 100 Hz; under 50 dB; 122 grams; 82.5 by 38 by 102 millimeters; 100 percent waterproof closure.
The 16 intensities are grouped: Gentle 1 to 5, Regular 6 to 10, Deep 11 to 16. The collection page calls these three cleansing modes.
Firming massage mode is entered with a double press. Manual massages can run up to 15 minutes with intensity set in the app; the app also offers four guided treatments of two to four minutes and five massage routines, three of which can be saved to the device.
This is the level of documentation we wish every device on the counter had. Compare it with the Dyson Supersonic Nural, which prints sensor behavior but not battery chemistry, or the Oral-B iO Series 9, which prints modes but not frequency.
How the pricing is structured (as of October 2026)
We have to be plain about this section. foreo.com served our server Vietnam-region pricing on October 17, 2026: 6,799,000 dong for the LUNA 4, with a bundle struck through at 8,318,000 dong. Cookie and URL country parameters did not change the currency, and FOREO's US-specific paths returned 404.
We do not print US prices from search snippets or from third-party stores, so this review carries no US-dollar list price. The value score is provisional until foreo.com shows one from a US location.
What the region page does show is the ladder. LUNA 4 go was about half the LUNA 4 price, LUNA 4 mini about 70 percent, LUNA 4 MEN the same price, and LUNA 4 plus (LED and microcurrent) about double, by editorial arithmetic from the dong figures.
There is no consumable. The silicone head is not replaced, the battery is not user-serviceable, and FOREO sells cleansers separately but does not require them.
Ease of use: what the 4.5 is built from
One button, a built-in timer, 16 levels and a waterproof body make this the simplest device in our skin-device cluster. The manual's cleansing routine is one minute of circular motions until the timer stops the device; a double press enters massage mode.
The battery figure removes the main irritation of powered skin tools. At one cleanse a day, 600 uses is about 20 months between charges, by editorial arithmetic from FOREO's own numbers. Charging is USB and takes two hours.
The deduction is the app dependency on the massage side. Manual patterns work without a phone; the four guided treatments and intensity adjustment for long massages do not. If the app is ever discontinued, as NuFACE's Smart App is being, those features would go with it.
Features: what the 4.1 is built from
The feature list is honest and modest: T-Sonic cleansing at 100 Hz, three intensity bands, five massage patterns, an app with four guided routines, and a waterproof silicone body. FOREO does not claim exfoliation, LED, microcurrent or heat on this model; those live on the LUNA 4 plus.
The clinical claims are where the score softens. 99 percent of dirt, oil and makeup residue removed, and 35 times more hygienic than nylon-bristle brushes, are attributed to third-party clinical trials.
The page gives no sample size, no date and no link. We report them as FOREO's claims, not as findings.
The absence of an IPX code is a small documentation gap. 100 percent waterproof closure is a description; a rating would tell you whether submersion is covered. The manual's instruction to dry the device before charging suggests the port is the limit.
Value: what the 3.4 is built from
Scoring value without a confirmed US price is guesswork, so this grade is deliberately conservative and will be revised when foreo.com shows a dollar figure from a US location.
What we can say: the LUNA 4 has no running costs, a battery rated for years of daily use, and a two-year warranty. Against the NuFACE Trinity+ at $395 plus activator gel, a cleansing brush that needs no consumable is structurally cheaper over time, whatever its sticker.
Against a plain silicone brush with no motor, the LUNA 4 asks you to pay for the 100 Hz motor, the 16 levels, the timer and the warranty. Whether that is worth it depends on the number we cannot read today.
Support and warranty: what the 3.8 is built from
The manual states a two-year limited warranty from the original purchase date and directs owners to register through the FOREO app or at foreo.com/product-registration. The collection page repeats a two-year warranty line.
FOREO's dedicated warranty page returned a 404 on October 17, 2026. FOREO markets a 10-year quality guarantee elsewhere; we could not verify its terms for this model, so we do not count it.
The manual is the support bright spot. It is posted in full, with a troubleshooting section, the battery specification and the safety list. That is better documentation than several devices we have read, including the Panasonic Arc6, whose US page is thin.
What verified users report
FOREO's collection page links to independent reviews by Bazaarvoice, but the rating and review count did not render in the page text we could read on October 17, 2026. We therefore do not print an owner score for the LUNA 4.
We note FOREO's own consumer-trial figures appear on the page and treat them as marketing. Where a brand prints the share of sampled reviewers, as NuFACE does for the Trinity+, we report it; FOREO's page did not show such a line.
If an owner rating matters to your decision, read a retailer page dated the day you buy and check whether sampled reviews are flagged.
Safety: what FOREO states
The manual says to consult a dermatologist before use if you have a skin condition or any medical concern, to stop immediately if cleansing is uncomfortable, not to run the device for more than three minutes at a time, to dry it before charging and never to use it while charging, and to supervise children closely around it.
FOREO's FAQ states the LUNA 4 is safe to use while pregnant or breastfeeding. The manual does not mention pacemakers or implanted devices, which are relevant to microcurrent tools but not to a vibrating cleansing brush.
None of this is medical advice. The LUNA 4 is a cosmetic brush; a clinician decides what your skin can take.
Limits stated by the vendor, and what the page leaves out
Stated: 100 Hz, 16 intensities, three modes, five massage patterns, 520 mAh battery, two-hour charge, 600 uses, 90-day standby, 122 grams, dimensions, under 50 dB, waterproof closure, two-year warranty, daily use, three-minute limit.
Not stated as of October 17, 2026: a US-dollar price from our location, an IPX code, the sample size behind the 99 percent and 35 times claims, the 10-year quality guarantee terms, and an owner rating in readable form.
The trade is clear: FOREO documents the hardware better than almost anyone and documents the price and the studies worse than it should.
Alternatives
Choose the NuFACE Trinity+ if your goal is toning rather than cleansing. It lists at $395 on mynuface.com as of October 17, 2026, carries FDA 510(k) K201782, and needs a conductive gel every session. Read our NuFACE Trinity+ review and the LUNA 4 vs Trinity+ comparison.
Choose the FOREO LUNA 4 mini or go if you want the same silicone cleansing idea at a lower price and can give up the firming side; on the region page they were about 70 percent and 50 percent of the LUNA 4 price.
Choose the FOREO LUNA 4 plus if you want LED and microcurrent in the same body; it was about double the LUNA 4 price on the region page. We have not reviewed it.
For the full ranking see the best at-home skin and hair-removal devices guide.
Bottom line
The FOREO LUNA 4 is the cleansing brush to buy if you want the maker to show its work: the manual prints frequency, battery chemistry, charge time, use count, weight, noise and warranty. Few devices on our counter do that.
Two things stop us from calling it a clear value pick. The US price could not be read from foreo.com on October 17, 2026, and the clinical claims arrive without sample sizes.
Check the price the day you buy, treat the percentages as marketing, and you will know exactly what you are getting.
For the other devices in the bathroom, see the best electric toothbrushes, the Philips Sonicare 9900 Prestige review, and the note on what the ADA Seal and a pressure sensor tell you, which applies the same read-the-manual method to toothbrushes.
Buy it if
- You want a one-minute cleanse with a timer that stops the device - the manual's built-in timer and the under-three-minutes limit are designed for exactly that routine.
- You travel and hate chargers - 600 uses on a two-hour USB charge means a handful of charges a year at one use a day.
- You want the massage side as a bonus, not the main event - five manual patterns run without the app; treat the guided routines as optional.
- You want the maker's manual before you buy - FOREO posts it in full, which is more than most skin-device brands do.
Skip it if
- You need a confirmed US price before deciding - until foreo.com shows it, compare retailer pages dated the day you buy.
- You want a device with a regulatory claim behind it - the LUNA 4 is a cleansing brush; it makes no FDA clearance claim and needs none. The NuFACE Trinity+ is the cleared microcurrent option.
- You want every firming routine offline - the four guided programs require the FOREO app.
Frequently asked
How much does the FOREO LUNA 4 cost in the US?
We could not read a US-dollar price from foreo.com on October 17, 2026; the site served Vietnam-region pricing of 6,799,000 dong to our server and ignored every country parameter we set. We do not print prices from search snippets or third-party stores, so check foreo.com or a retailer page dated the day you buy.
How long does the LUNA 4 battery last?
Per the LUNA 4 manual on foreo.com, a two-hour charge delivers up to 600 uses, based on a one-minute treatment per use, from a Li-ion 520 mAh 3.7 V cell. Standby is 90 days. At one cleanse a day that is roughly 20 months between charges, by editorial arithmetic.
Is the FOREO LUNA 4 waterproof?
FOREO states a 100 percent waterproof closure and says the device is made of bacteria-resistant silicone and is easy to clean. No IPX code is printed in the manual or on the collection page. The manual says to dry the device completely before charging and not to use it while charging.
What is the difference between LUNA 4 and LUNA 4 plus, mini and go?
The collection page lists LUNA 4 as the 2-in-1 cleansing and firming device; LUNA 4 plus adds LED and microcurrent; LUNA 4 mini is a dual-sided cleansing massager; LUNA 4 go is the travel size. On the Vietnam-region page the plus was about twice the LUNA 4 price and the go about half, as of October 17, 2026.
Can you use the LUNA 4 every day?
FOREO recommends daily use, with a one-minute cleanse and a built-in timer that switches the device off. The manual says not to use it for more than three minutes at a time and to stop if cleansing is uncomfortable. If you have a skin condition, the manual says to consult a dermatologist before use.
What warranty does FOREO give on the LUNA 4?
The manual states a two-year limited warranty from the original purchase date, with registration through the FOREO app or foreo.com/product-registration. FOREO's warranty page returned a 404 when we checked on October 17, 2026, so the 10-year quality guarantee FOREO markets elsewhere could not be confirmed for this model.
Sources
- FOREO LUNA collection page (LUNA 4 specifications and claims) - checked October 17, 2026
- FOREO LUNA 4 user manual (technical specifications, warranty, safety) - checked October 17, 2026
- FOREO warranty page (returned 404 on the check date) - checked October 17, 2026
Update history
- October 17, 2026 - First published from the foreo.com LUNA collection page and LUNA 4 manual, read October 17, 2026. US-dollar price not readable from our location; value score provisional.
- October 17, 2026 - Title shortened to 60 characters or fewer; links to unpublished cluster pages held until those pages go live.
Visit FOREO LUNA 4
We have no affiliate relationship with this vendor. Link goes to the official site.