[Most Exercise Spin Bikes use this monitor] - for Stationary Bikes with "head phone jack" look connection tips. E.g. by for bikes Sunny, , L-Now, , , Pleny, , , Faafuu - 90% of Amazon as well as domestic 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) [Optional Heart Rate Monitoring Feature]An optional 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. 2 x AAA Batteries Included Colour: Black material: plastic Package Contents:1 x Exercise Bike Computer Only the above package content, other products are not included. Note: Light reflection 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.