Review on Alonefire H42UV: High-Powered 36W 365nm USB Rechargeable UV Flashlight - Ideal for Pet Urine Detection, Resin Curing, Fishing, and Scorpion Hunting with UV Protective Glasses and 4xLithium Battery by Haley Johnson

Some good, some bad. Relatively bright UV output, but more of a low beam than a beam diffuser. Not at all as powerful as the Convoy C8. Slightly badly designed. For example, the switch is easily accidentally activated because it protrudes from the case, allowing it to turn on when placed on a flat surface. The thread is very rough and can become twisted if care is not taken. Literally a handful, this flashlight is about the size of a can of Red Bull without any attachment to a lanyard. There should be some sort of holster or similar to keep it from popping out of your hands during use. Battery life is very good, but mine doesn't turn off after about three minutes as I saw in the description. here. The supplied batteries are quite weak (2000 mAh) and not original, not as described by Tenergy. You will definitely need more mAh. All in all not a Convoy C8, but a decent price.