Triple mode, USB rechargeable, ultra-bright tail light with spot / flood combo mode providing 100 lumens of extreme visibility. Tool-free mounting and easy removal on aero or round seatposts, or helmet 4 modes: constant, blinking/constant, constant/blinking sequence, and blinking USB rechargeable IPX 6 Waterproof 5.7x4.1x2.5cm 30g Max output: 100 Lumens Lamp: 9 super bright LEDs Battery: 3.7V 700mAh Lithium Ion Burn time: 2hr (Constant), 5hr (Blinking/constant), 10hr (Constant/blinking sequence), 30hr (Blinking) Charge time: 4 hr