CYCPLUS M2 advantages: 1. It adopts GPS active antenna, which has better signal receiving ability and faster positioning compared with ordinary passive antenna. And GPS cold boot can be completed within 1 minute. 2. With ublox gps chip, It has higher receiving sensitivity to shorten the positioning time and improve the positioning accuracy; 3. With 2.5 inch screen, It's easier to see the information on the screen quickly and clearly during the day and night; 4. With 16M Internal memory, M2 can save about 3000km cycling data; 5. It supports BLE5.0, and can quickly synchronize data to mobile phone; 6. It supports automatic power-off and automatic pause; 7. 1 year Warranty is provided. CYCPLUS M2 GPS Bicycle Computer Cycling Speedometer Bike Accessories Speed Odometer Waterproof Bluetooth ANT for Road Bike MTB - 1100mAh rechargeable battery, 30+ hours super long endurance -Type-C charging (about 3.5hours for full charge) - Support XOSS app data analysis and sync to Strava and Training Peaks. - Real time data showing:max/current/average speed, cadence, heart rate, power,gradient; Time, distance, ascent, ODO, altitude, temperature - ANT+ Peripheral supported: heart rate monitor, speed sensor, cadence sensor, powermeter - Manuallly light the backlight - 2.5 inch LCD screen -IPX6 waterproof (Rain is ok, but dont soak in water for a long time ) -16M Memory Capacity (Approximately 150 hours of data -GPS, Glonass and Galileo Please note the mount holder Z2 is for 31.8mm handlebar.