Compact bright and versatile the ViZ150 stands out with high visibility from OptiCube™ lens technology and Daytime Hyperflash™ mode in an economical package. 3 LEDs 150 lm Highly visible during daytime 300 degree visibility Long rear beam projection OptiCube™ lens technology Lithium-ion rechargeable battery USB-C rechargeable USB-C cable not included Low battery indicator Four light modes Constant / Flashing / Group Ride / Daytime HyperFlash Mode memory function Battery Auto Save The mode automatically changes to flashing when the battery power gets low. New seat post bracket SP-15 which fits contemporary kammtail aero seatpost Snap System™ SPECIFICATIONS Dimensions: 21 x 62.5 x 32.5 mmWeight: 27 gLight source: Red LED x3Battery: Li-ion rechargeableRuntime:– Constant 20 lumens: 5 hrs– Flashing 15 lumens: 70 hrs– Group Ride 5 lumens: 33 hrs– Daytime HyperFlash 150 lumens: 15 hrsRecharge time: 3 hrs 0.5AMount size: φ21.5–32 mm. Fits up to 130 mm outer circumference SP-15Water resistance: IPX4Other features: Battery auto save low battery indicator light mode memory