Function description of magnetic control car instrument, spinning bike instrument: 1. TIME: Press the MODE button to display the time. This value represents the time from the beginning to the end of the movement. 2. SPEED: Press the MODE button to display the speed. This value represents the speed of the current movement. 3. DISTANCE: Press the MODE button to display the distance. This value represents the distance from the beginning to the end of the movement. 4. CALORIES: Press the MODE button to display the calories. This value represents the energy burned from beginning to end. Works for headphone-like cables] Both speedometer and pulse tracking connection are via 3.5mm female jack on the back of the monitor - adapters (NOT INCLUDED) may be needed if the device also happens to have FEMALE jacks (rare cases). [Compatible with most indoor exercise bikes] - for stationary bikes with \"headphone \"-like connection tips. E.g. many bike models from Sunny, , L-Now, , , Pleny, , , Faafuu - 95% of Amazon as well as domestic [Heart rate monitoring function] that works with bikes with heart rate sensors (usually 2 x metal parts on the handle). Rewiring MAY be required for some specific models. [2 x AAA batteries not included - Required] Batteries are NOT included. Product size: 108x163mm LCD size: 48x23mm Color: white Material: plastic Package contents: 1 * Monitor Speedometer with pulse Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.