Features： 1、With saddle mounting bracket and adjustable silicone strap, it can be quickly installed on bicycles, saddle posts and helmets. 2、Appearance adopts for turbo engine design, cater to the rider's racing psychology, faster. 3、USB rechargeable, convenient and fast, large capacity battery, long battery life. 4、5 lighting mode, including marquee, for Tai Chi, breathing, fast flash and slow flash. 5、Double tap the switch to turn on/off the smart braking mode, easy to install and detach. Specification： Item Type: Bike Brake Light Material: Aluminum Alloy+PC Product Color: Blue Weight: Approx. 81.0g/2.9oz Battery: Li-ion Battery 380mAh (include) Charging Mode: USB Fast Charging Using Time: 5 hours (Strong Light) More than 10 hours (Low Light) Mode: 5 Modes: Touch Switch (Marquee, for Tai Chi, breathing, fast flash, slow flash) Long Press the Switch: In the OFF state, touch the switch and the light will light up, and the mode is the last time. Turn off the Switch: Press and hold the switch for 1 second to enter the OFF state Double-Click the Switch: Turn on/off the smart brake mode Package List： 1 x Bike Brake Light 1 x Data Cable 1 x Rubber Ring 1 x Fixing Bracket Hook 1 x Chinese English Japanese Manual