Characteristics 1. 3-in-1 bike computer; (cycling mode, cadence mode, heart rate monitor) 2. Large screen 2.8 3. Extension bracket 4. Full screen Led backlight Specifications Name: Cycling computer, speedometer, odometer, stopwatch Waterproof: Yes Suitable for MTB, road, mountain and other types of bikes. Color: Black Size: about 80 * 55 * 19mm Battery type: CR2032 * 1 Common problems The figures do not change:Check if the sensor battery is properly installed. 1. Meaning of "+" and "-" on the screen:"+" Means your speed is faster than average speed; "-" means your speed is slower than average speed. 2. Speed ??value faster or slower:Check the setting, it is usually related to the wrong wheel circumference or the measurement unit setting. 3. Not applicable:The bike computer is not applicable for motorcycles or vehicles.Our GPS Cycling Computer Perfect device can also be used for hiking, climbing, and many other fun, adventurous outdoor activities.