New rear bike light with unique white light for headlight use ---- B4 has the same size(45g, 87mm) and brightness(110 lumens) as its brother lights and of course is waterproof and rechargeable while providing extra-wide 150 degree angle and 492 feet distance visibility to be a competent daytime bike rear light. What's the news? It has special white lights to be used as also front light 5 Stylish lighting modes ---- besides the common steady/flash modes in red, this waterproof bike light offers other 3 striking settings: steady in white, flash in white, strobe in red & white, which calls a lot of attention and your visibility is absolutely garanteed USB rechargeable with decent battery life ---- 2 hours charging = 4 to 10h lasting. For a quick charge, just connect the cycling light with any USB devices such as power bank, car charger or ac outlet adapter. (please fully charge it before first using when you receive the light.) Fits every bike ---- this rechargeable bike light installs in seconds without tools for all type of bikes, road bike, mountain bike mtb, hybrid and also can be used as helmet light, backpack light, wheelchair light, scooter light and caution light.