ROCKBROS BL-S2 IPX6 Waterproof 6 Modes Smart Touch Brake Sensing Bicycle Tail Light ?Button-free design,power on/off and mode switching are achieved by touching the center of the light cover ?When braking or decelerating during cycling,the tail light automatically illuminates and stays bright for 2 seconds,conveying deceleration information to the rear for increased warning ?In the same frequency mode,when teammates equipped with the same tail light ride close to each other,the tail light automatically switches and maintains the same frequency of lighting mode ?In smart mode,the built-in light sensor constantly monitors ambient light. It automatically lights up in low light conditions and sleeps in bright conditions (without affecting the brake light function). No need to manually operate the tail light when entering tunnels or caves ?In smart mode,it automatically enters sleep mode after 2 minutes of inactivity. It lights up automatically upon detecting vibrations,eliminating the need for frequent manual switching of the light ?6 lighting modes: Single Flash,Double Flash,Diffusion Flash,Steady,Ripple Flash,Random Flash ?Comes with a USB Type-C charging cable,compatible with 5V adapters,power banks,etc. The remaining battery level can be judged by the side light ring indicator ?Equipped with both seat bow and seat post brackets,allowing for flexible installation positions ?Specifications: ?Product Code: 24720006001 ?Material: Aluminum alloy shell + PC lampshade + plastic bracket ?Battery: 400mAh ?Charging: 5V 200mA (approximately 2-3 hours to fully charge) ?Battery Life: 10-20.5 hours ?Seat Bow Spacing: Suitable for 38-54mm ?Waterproof Rating: IPX6 ?Weight: Approximately 30g (including saddle bracket) Package included: ?1 x Tail Light ?2 x Rubber Ring ?1 x Charging Cable ?1 x Seat Bow Bracket ?1 x Seat Post Bracket (with Gasket) ?3 x Cable Tie