CoolChange 2.8'' Wired Bicycle Computer Waterproof Odometer Bike Measurable Cycling Stopwatch Speedometer Build in Microphone

Build in Microphone

and you can also measure your heart rate manual

WiFi real time transmission makes you enjoy the beautiful scenery at the first time

KIONIX KX022-1020 Heart Rate Sensor: Silicon labs Si1142 OS: Android 4

Eyepiece with FMC blue film

CoolChange 2.8'' Wired Bicycle Computer Waterproof Odometer Bike Measurable Cycling Stopwatch Speedometer Build in MicrophoneProduct Features: 2. 8 inch large screen for 4 parts showing data, no need to push button frequently Allow two sets of wheel diameters and other data for bicycle A and bicycle B Night light feature with high brightness light source for a clear view of all data during your night trip Length unit options of kilometer mile Low battery indicator for you to know the working conditions of the odometer Bicycle oil maintenance reminder to secure your