See and be seen with the BC21R Bike Light with Rechargeable Battery from Fenix Flashlight. This lamp shines at outputs from 100 to 880 lumens and features an Optimized Dual Distance Beam for both up-close and long-range vision, and can be mounted and dismounted quickly.
A Cree XM-L2 T6 neutral white LED is the main light source; the BC21R also has red side lights that mimic the main light's mode, flashing or constant-on. The light will fully charge via micro-USB in about four hours. Settings include low, medium, high, turbo, and flash. The power button will start to flash if battery power drops below 20 percent, and you can check the power level with the light off by single-clicking the power button – it will stay on at 60 percent or higher, blink slowly at 20-60 percent, and blink fast below 20 percent.
The light has built-in overheat, over-charge, and over-discharge protection, and its digitally regulated output assures consistent performance. Rated at IPX6, it can withstand rain. It comes with a quick-release mount, mounting shim, and strap, an 18650 rechargeable battery, charging cable, and spare O-ring.