Features: Wireless remote controller can easily control the function of taillight during cycling. 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 (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