Features： 1、Wireless remote controller can easily control the function of taillight during Cycle. 2、Built-in 500mAh rechargeable battery, allow the bike taillight to be fully charged in 1.5-2 hours and can work for about 8-9 hours. 3、3 adjustable lighting modes by controlling the power switch of light for your different demands. 4、Rainproof design provides convenience during rainy days. (NOTE: Please do not soak into water for long time.) 5、Come with installation parts,easily install on your bike helmet. Specification： Features: Wireless remote controller can easily control the function of taillight during Cycle. Built-in 500mAh rechargeable battery, allow the bike taillight to be fully charged in 1.5-2 hours and can work for about 8-9 hours. 3 adjustable lighting modes by controlling the power switch of light for your different demands. Rainproof design provides convenience during rainy days. (NOTE: Please do not soak into water for long time.) Come with installation parts,easily install on your bike helmet. Specification: Model: Type A / Type B / Type C / Type D (optional) Material: Plastic Model Type A Type B Type C Type D Installation Position Bike Seatpost   Bike Seatpost Helmet Helmet Left&Right Turn Signals  Control Method Gravity Sensor Wireless Remote Controller Gravity Sensor Wireless Remote Controller Battery Capacity 500mAh Charging Time 1.5-2hrs Working Time 8-9hrs Waterproof Rainproof 3 Lighting Modes Always-on Mode / Breathing Flash Mode / Strobe Mode Light Size 120*34mm Light Weight 40g Package Size 13.5*9*5cm Package Weight 85g 110g 85g 110g Package List 1* Light 1* Cable 1* Manual 1* O Ring 1* Light 1* Cable 1* Manual 1* O Ring 1* Controller 1* Strap 1* Light 1* Cable 1* Manual 1* Tape 1* Light 1* Cable 1* Manual 1* Tape 1* Controller 1* Strap (Type A)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* O Ring (Type B)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* O Ring 1* Remote Controller (with a CR2032 battery) 1* Silicone Strap (Type C)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* Fastener Tape (Type D)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* Fastener Tape 1* Remote Controller (with a CR2032 battery) 1* Silicone Strap Package List： 1* Light 1* Type-C Charging Cable 1* User Manual 1* O Ring (Type B)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* O Ring 1* Remote Controller (with a CR2032 battery) 1* Silicone Strap (Type C)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* Fastener Tape (Type D)Package List: 1* Light 1* Type-C Charging Cable 1* User Manual 1* Fastener Tape 1* Remote Controller (with a CR2032 battery) 1* Silicone Strap