USB Rechargeable Intelligent Brake Bike Rear Light 
Material: Aluminum Alloy; Size: 43*27*21mm  Unit weight: 30g
LED Source: COB red LED 28 chips; Max output: 1W
Max light output: 20 lumens
4 Modes: High light-MID--Flash--Fast Flash
Automatically enhance the brightness for 5 seconds if any downhill, brake, deceleration.
Battery type: Rechargeable Lithium ploymer battery(3.7V 280mAh)

Unit package: brake light, silicone bracket, USB cable & color box