Review on KEYWELL USB Rechargeable Bike Tail Light – Super Bright LED Bicycle Rear Light with Red/Blue/Green Color – Waterproof Taillight for Cycling Safety by Robert Wood

Excellent light, very bright, many color options in steady or flashing mode. I use a green flashing light for a light attached to my bike frame (in addition to a separate red flashing light). I've found that there are a lot of red lights on the road at night - the green (or blue) flash makes the cyclist stand out and looks different. I bought two of these - one for the bike frame and the other on the back of my Scott MIPS helmet which also flashes green. It's great that it's rechargeable - I charge all four lights that I use after every ride (white light in the front, red light in the back and two green lights - one on the helmet and one on the frame in the back). The only downside is the bike (or helmet) mount - they offer four rubber straps to attach the light - I'd pay a few bucks more for a hard mount that stays on the bike like my red light. The straps offer versatility though - I used the long one to attach the light to my helmet and the short one to attach the second light to the rear frame of the bike. While the light stays permanently attached to the helmet, it is difficult (in the dark) to remove the light from the frame using just the tape mount. Overall this is a very good flashlight - you'll love that it's so bright and rechargeable.