Compact and lightweight rear bike light with two high-brightness LEDs and USB charging. Easily attached with a rubber strap to your saddlebag, Topeak panniers or bike helmet. Maximum luminous flux: 30 Lumen Light source: RY: 1 super bright red LED & 1 super bright yellow LED Battery: 3.7V 250mAh (integrated) Light modes: 3 hr (Constant) 3.5 hr (Upper : Constant / Lower : Blinking) 30 hr (Blinking) Charging: Micro USB / 2 hrs. Input: 5V 500mA Light material: injection moulded polymer Fixing: rubber belt, on saddlebag (ø25.4 - ø34.9mm), Topeak panniers, cycling helmet Waterproof: IPX 6 Dimensions: 3.9 x 3.7 x 2.1 cm