Usage Tips: Function description of magnetic control car instrument, spinning bike instrument: 1. TIME: Press the MODE button to display the time. This value represents the elapsed time from the start of the movement. 2. SPEED: Press the MODE button to display the speed. This value represents the current speed of movement. 3. DISTANCE: Press the MODE button to display the distance. This value represents the total distance traveled during the movement. 4. CALORIE: Press the MODE button to display the calories. This value represents the energy burned during the activity. Compatible 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: Designed for stationary bikes with "headphone" style connection tips. Compatible with many models from brands such as Sunny, L-Now, Pleny, Faafuu, and others. Fits approximately 95% of indoor and domestic exercise bikes. Heart Rate Monitoring Feature: Works with bikes equipped with pulse sensors (typically two metal contact points on the handlebars). Re-wiring might be required for certain models. 2 x AAA Batteries Not Included: Batteries are NOT included. Product Size: 108x163mm LCD Size: 48x23mm Color: White Material: Plastic Package Contents: 1 * Monitor Speedometer with Heart Rate Function Only the above package content is included; other products are not included. Note: Lighting and different display settings may cause slight color variations between the item and the image. Measurement error allowance is +/- 1-3cm.