Super waterproof, button switch and USB charging interface, covered with expansion rubber, safe riding in rainy days. Click switch button switch, Multi function designUSB interface charging, the lithium ion polymer battery is the world's most popular now (3.7V, 1200mAh), reciprocating charging and discharging, the faster charging speed, the longer discharge time, general charging 3-4 hours, the discharge time is about 3-7 hours.Quick dismounting lamp holder: the lamp holder nut is directly fixed on the lamp inside, don't worry, the manual knob type screw, without using any tools can direct disassembly, convenient for handlebar diameter: 20-31mm.This product is new in shape, using the latest imported high-power highlight (about 2000lm) as the light source, highlighting the trend of fashion and technology. High performance optics: the use of crystal acrylic transparent spotlight, light irradiation distance, night Viewing distance meters 30-50 meters, and fully protect your riding safety.Lamp holder quick disassembly and assembly: directly press along the concave guide rail of the lamp holder, it can be installed successfully; when dismounting, pinch the buckle on the right of the lamp holder; meanwhile, the lamp holder is pulled forward and can be removed successfully.