REAR BIKE LIGHT --- our B2, with 36 COB LEDs, has a real and lab tested output of 110 LUMENS, it39, 150 degree beam angle and 150m visibility for safety. 5 STYLISH LIGHTING MODES----Besides common/common flash modes in RED, this waterproof bike light offers 3 other striking settings: Steady in BLUE, Flash in BLUE, Strobe in RED and BLUE, which calls for a lot of attention and your visibility is absolutely guaranteed USB RECHARGEABLE WITH DECENT BATTERY LIFE ---- 2 hours charge = 4-10 hours runtime (limited by its compact size and amazing brightness). For fast charging, simply connect the rear bike light to any USB device such as a power bank, car charger or AC outlet adapter. (Please fully charge it before first use when you receive the light.) FITS EVERY BIKE ---- This rechargeable bike light installs in seconds without tools for all types of bicycles, road bike, mountain bike, hybrid bike and can also be used as helmet light, backpack light, wheelchair headlight. ATTENTION: The rubber band (strong and elastic) must be stretched in a suitable position to be fixed firmly so that it does not fall off during riding. Package includes: 1 x tail light, 2 x mount, 1 x cable and 1 x user manual