Raptor II Pro Bluetooth Cycling Computer Wireless Bike,18 Functions Backlight LCD Display with Cadence Sensor Speedometer Odometer Calorie Heart Rate Counter WaterProof and 3 Function Bicycle Black NOTE: IS BLACK HANGER,NOT GREEN--- STABLE: BLE 4.0 wireless bicycle computer with headlight Speed and cadence sensor in one Multi-Function: 18 functions in one device to address your cycling need 2.1'large screen, much clearer Smarter: LCD Backlight brightness is adjustable via APP and auto-working when the headlight on, safer Pro optical design, far and wide range viewing distance Intelligent Management:Auto light downshift when low battery, improved security Auto wake-up when start riding after break Data auto saving Integrated design, good waterproof Battery protecting circuit and intelligent power management