A UV light sounds like a gimmick until the first time you sweep it across a hotel bed. Then it becomes the most practical thing on your keychain.
That is the pitch for the RovyVon A8X UV: a keychain flashlight with a proper 365nm UV sidelight next to the usual white LED. Watch the video above for the quick version, then read on for the full breakdown of what the UV light is actually good for and what the light itself brings to the table.
The 3 UV uses from the video
1. Checking hotel room cleanliness
This is the big one. Bodily fluids, food residue, and a lot of cleaning-product residue fluoresce under 365nm UV light. Turn off the bathroom light, sweep the UV across the sheets, the toilet seat, the remote control, and the light switches, and you will see exactly how thorough housekeeping was. It takes ten seconds and it has ruined more than a few hotel stays for people in the best possible way. For anyone who travels as much as this channel does, this alone justifies the keychain space.
2. Verifying bills and currency
Banknotes in most countries include UV-reactive security features: strips, threads, and watermarks that only show up under UV light. A quick pass over a bill tells you whether those features are present. It is not a forensic lab test, but it is a fast sanity check when you are handed cash in unfamiliar currency, which happens a lot on the road.
3. Charging the lume on your watch
Watch lume (the glow-in-the-dark paint on hands and markers) charges fastest under UV light. A few seconds under the A8X’s UV sidelight and your dial is glowing at full brightness. Given this channel’s watch obsession, this use probably needs no further explanation.
More things the UV light is good for
Finding pet stains. Dried urine fluoresces brightly under 365nm UV. If you have ever played “where is that smell coming from” with a cat, this ends the game. Checking IDs and documents. Driver’s licences, passports, and event tickets often carry UV security printing. Curing UV resin and glue. UV-cure adhesives and resins (used in fly tying, electronics repair, and crafts) harden under 365nm light. Spotting scorpions. If you ever find yourself in the desert Southwest, scorpions glow an eerie green-blue under UV. More of a party trick than a daily use, but a fun one.
One safety note: do not shine UV light into anyone’s eyes, including your own. It is low power on a keychain light, but the rule still applies.
The light itself: RovyVon Aurora A8x
The UV sidelight is the headline, but the A8x is a serious little flashlight underneath it. The exact UV variant is the A8xU (UV plus red plus white sidelights). There is also an A8xY variant with amber, red, and blue sidelights instead, so make sure you are looking at the U model if you want UV.
Main LED: your choice of CREE XP-G3 (cool white, 6500K, max 650 lumens) or Nichia 219C (neutral white, 4500K, high CRI, max 450 lumens). The CREE is brighter; the Nichia renders colours more accurately.
Modes: Moonlight (3 lumens, 66 hours), Low (25 lumens, 10 hours), Medium (400 lumens), High (650 lumens). High and Medium step down automatically after about 100 seconds to manage heat, which is normal for a light this small pushing this much output.
Sidelights (triple-click): UV 365nm, red, red beacon, red flash. A fourth click gets the white sidelight in low and high. The red modes are handy for preserving night vision.
Battery: built-in 330mAh lithium-polymer cell, good for up to 66 hours on the lowest mode. It is not user-replaceable, which is the standard tradeoff for lights this small.
Charging: Micro-USB, full charge in about 90 minutes. A breathing blue indicator LED shows charging; solid blue means done.
Size and weight: 60.5 mm long, 15.6 mm in diameter, 14.8 grams. It disappears on a keychain.
Body: translucent polycarbonate. You can see the internals, and the body acts as a diffuser, so the sidelights double as a little lantern.
Durability: rated equivalent to IP66 for water resistance and 1.5-metre drop resistance.
Operation: press and hold for momentary on, double-click for constant on, single clicks cycle brightness. The whole thing is one-handed.
Independent testing (1lumen.com) measured the high mode at around 518 lumens at turn-on rather than the full claimed 650, which is typical of the category. Nobody is buying a 15-gram keychain light for laboratory-grade output figures.
Specs at a glance
Model: RovyVon Aurora A8xU (UV / Red / White sidelights). Main LED: CREE XP-G3 6500K (650 lm) or Nichia 219C 4500K (450 lm). UV sidelight: 365nm, approx. 3-hour runtime. Battery: 330mAh LiPo, built-in, up to 66 hours (moonlight). Charging: Micro-USB, approx. 90 minutes. Size: 60.5 x 15.6 mm. Weight: 14.8 g. Body: Translucent polycarbonate. Water resistance: IP66 equivalent. Drop resistance: 1.5 m. Beam distance: Up to 109 m (CREE version). In the box: Key ring, pocket clip, USB cable, manual, warranty card.
Where to buy: a note on the current model
The A8x has been superseded by RovyVon’s 4th-generation A8, which keeps the same formula (650-lumen main LED, UV plus red plus white sidelights, same keychain size) and upgrades charging to USB-C, adds a lock mode to prevent pocket activation, and adds magnetic clip and tail accessories. The A8x originally sold for around $46.95 USD.
If you want the UV version today, the current 4th-gen A8 with the UV/Red/White sidelight configuration is the one to get:
Check the current price on Amazon: RovyVon Aurora A8 (4th Gen) with UV sidelight on Amazon
Make sure the listing shows the UV/Red/White sidelight option before ordering, since RovyVon sells several sidelight configurations.
Verdict
The RovyVon A8X UV is the rare EDC item where the gimmick feature turns out to be the main event. The 650-lumen main light is genuinely useful, the 15-gram size means you will actually carry it, and the 365nm UV sidelight earns its keep every time you check into a hotel. If your keychain has room for one more thing, this is a strong candidate.
Specs verified against RovyVon dealer listings, GoingGear, BatteryJunction, Flashaholics UK, and 1lumen.com, October 2026. The A8x is the previous generation; the buy link above is the current 4th-gen A8 with the same UV/Red/White sidelight configuration. Prices move around, so check the live Amazon price before buying.