SHANREN Raptor Smart Bike Light Includes 2.4G Wireless Bicycle Computer LCD Display 1.The first hybrid product: bike light and computer in one 2.Track time, distance, speed and calories burned 3.Syncs the sensor data in real-time using 2.4G wireless tech 4.Constant LCD backlight for night ride Built-in 2600Mah rechargeable Lithium battery can support 3hours working time,Micro USB can also external mobile power to increase working time