USB Rechargeable Intelligent Brake Bike Rear Light 
Material: Aluminum Alloy; Size: 52*53*38mm  Unit weight: 40g
LED Source: LED COB red light; Max output: 1W 
Max light output: 20 lumens
Mode: 6 mode( high, middle, low, low bright slow flash, middle bright slow flash, high bright fast falsh)
Click open to automatic mode. Long press for 3 seconds boot for manual mode.
Battery type: Rechargeable Lithium ploymer battery(3.7V 500mAh)
Function: Vibration response,Smart light perception,USB rechargeable
Unit package: brake light, silicone bracket, USB cable & color box