Function description of magnetic control car instrument, spinning bike instrument: 1. TIME: Press the MODE button to display the time. This value represents the duration of the workout. 2. SPEED: Press the MODE button to display the speed. This value represents the current speed during the workout. 3. DISTANCE: Press the MODE button to display the distance. This value represents the total distance covered during the workout. 4. CALORIE: Press the MODE button to display the calories. This value represents the energy burned during the workout. Works with HeadPhone-Look Cables. Both speedometer and pulse tracking connections are through 3.5 mm female jacks on the back of the monitor. Adapters (NOT INCLUDED) might be needed if the device has female jacks (rare cases). Compatible with most indoor exercise bikes - for stationary bikes with "head phone" look connection tips. For example, many bike models by Sunny, L-Now, Pleny, Faafuu - 95% of home and commercial indoor bikes. Heart Rate Monitoring Feature that works with bikes equipped with pulse sensors (usually 2 metal contact points on the handlebars). Re-wiring might be required for some specific models. 2 x AAA batteries not included - required for operation. Batteries are NOT included. Product size: 108x163mm LCD size: 48x23mm Color: white Material: plastic Package Contents: 1 * Monitor Speedometer with Heart Rate Sensor Only the above package content is included; other products are not included. Note: Lighting and different displays may cause the color of the item to appear slightly different from the real thing. Measurement allows an error of +/- 1-3cm.