How long does the battery last on a charge?

The battery is only 80mAh, so expect short runtimes. Treat it as a burst light for a few minutes at a time rather than an all-night lamp, and recharge over USB-C.

How bright is it compared with a phone flashlight?

The COB panel puts out 80 lumens as a wide flood. That is comparable to or brighter than many phone flashes but spread over a larger area, which helps for close-up work.

Does it use replaceable batteries?

No. It has a built-in 80mAh lithium battery that charges through a USB-C port, so there are no coin cells to buy or swap.

No water or dust rating is stated. Keep it out of rain and don't submerge it; it is best for indoor and dry outdoor use.

The key light itself. A USB-C charging cable is not listed, so plan to use your own.

Can it be used hands-free?

It is a keyring light, so it works best clipped to keys or hung from a loop. There is no stand or magnet listed, so hands-free use depends on where you hang it.