Unlike some bike lights that make false claims, our B2, with 36 COB LEDs, has a real, lab tested output of 110 LUMENS, this is perhaps the most powerful rear bike light under 30,to be a competent daytime bike turn signal with a wide 150 degree beam angle and 150m visibility for safety.5 STYLISH LIGHT MODES ---- Besides the common RED / flash modes, 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 ofattention and your visibility is absolutely guaranteed!USB RECHARGEABLE WITH DECENT BATTERY LIFE ---- 2 hours charge = 4-10 hours duration (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 charge it fully before first use when you receive the light.)FITS EVERY BIKE ---- This rechargeable bike light installs in seconds without tools for all types of bikes, road bike, mountain bike, hybrid bike and can also be used as a helmet light, backpack light, wheelchair lighthouse.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 while driving.