Powerful rear bike light with USB charging and four light modes. The maximum luminous flux of 100 lumens guarantees amazing visibility anywhere. The silicone strap allows easy attachment without tools on aero or round saddlebags or on a cycling helmet. Certified IPX6 waterproof. Maximum luminous flux: 100 Lumens Light source: 9 super bright LED's Battery: 3.7V 700mAh Lithium Ion (integrated) Lighting modes: 4, 3 hrs. (Constant) / 5 h. (Blinking+Constant) / 10 h. (Constant+Blink Sequence) / 30 h. (Blinking) Charging connector: USB Type-C Charging time: 3-4 h. Input: 5V 500mA Material: engineering grade polymer Fixing: silicone strip, fixing on aero or round seatposts(ø25.4 - ø34.9mm), rails, helmets, Topeak bags Waterproof: IPX 6 Dimensions: 5.7 x 4.1 x 2.5 cm Weight: 30 g