Description This is a premium bike taillight. The taillight can be easy installed in minutes, and do not need any tools, available for any frame with diameter within 22.2-31.8mm. It can charge on any USB device with 2-2.5 hours, and stays for 6 hours with high brightness, 11 hours with low brightness, 16 hours with blinking. Feature - Color: As shown. - Material: ABS. - Size: About 45x28x25mm. - LED: one piece of 0.5W LED. - Brightness: 5 lumens. - Battery: 3.7V 300mAh Li battery. - Waterproof rate: IP44 waterproof rate. - USB RECHARGEABLE BATTERY - Makes the charging easy and environmentally friendly. Never Waste Your Money on Batteries again! - SUPER BRIGHT LED LIGHT - Only one piece super bright LED for the taillight, full angle visible from the back, with high brightness to ensure your safety while is more power saving and can extend the working time. - THREE WORKING MODES - Can change modes according to different riding conditions, ensure your safety in any low brightness conditions. - 2 HOURS CHARGE - 16 HOURS STAYS - It can charge on any USB device with 2-2.5 hours, and stays for 6 hours with high brightness, 11 hours with low brightness, 16 hours with blinking. - EASY INSTALLATION & NO TOOLS REQUIRED - The taillight can be easy installed in minutes, and do not need any tools, available for any frame with diameter within 22.2-31.8mm. USB RECHARGEABLE BATTERY - Makes the charging easy and environmentally friendly Never Waste Your Money on Batteries again!|SUPER BRIGHT LED LIGHT - Only one piece super bright LED for the taillight, full angle visible from the back, with high brightness to ensure your safety while is more power saving and can extend the working time |THREE WORKING MODES - Can change modes according to different riding conditions, ensure your safety in any low brightness conditions |2 HOURS CHARGE - 16 HOURS STAYS - It can charge on any USB device with 2-2 5 hours, and stays for 6 hours with high brightness, 11 hours with low brightness, 16 hours with blinking