Wireless Bike Computer with Heart Rate Sensor Waterproof Cycle Odometer for Indoor Stationary Bikes and Magnetic Trainers Function of magnetic control car instrument, spinning bike instrument:<br> 1. TIME: Press the MODE button to display the time. This value represents the total time from the start of the movement to .<br> 2. SPEED: Press the MODE key to display the speed. This value represents the speed of the current movement.<br> 3. DISTANCE: Press the MODE key to display the distance. This value represents the total distance from the start to of the movement.<br> 4. CALORIE: Press the MODE button to display the calories. This value represents the total energy burned from the start to .<br> Works for HeadPhone-Look Cables]Both speedometer & pulse trakcing connection are through 3.5 mm female jacks on the back the monitor - adapters (NOT INCLUDED) might be needed if the device also happen to have FEMALE jacks (rare cases).<br> [Compatible with Most Indoor Exercise Bikes] - for Stationary Bikes with "head phone jack" look connection tips. E.g. many bike models by Sunny, , L-Now, , , Pleny, , , Faafuu - 95% of as well as domestic<br> [Heart Rate Monitoring Feature]that works with bikes with pulse sensors (usually 2 x metal pieces on handle bars). Re-wiring MIGHT be required for some perticular models.<br> [2 x AAA Batteries Not Included - Required]Batteries are NOT included.<br> Product size: 108x163mm<br> LCD size: 48x23mm<br> Colour: white<br> Material: plastic<br> Package Contents:<br> 1 * Monitor Speedometer W/ Heart Rate<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.