1. [Most Exercise Spin Bikes use this monitor] - for Stationary Bikes with "head phone jack" look connection tips. E.g. for bikes Sunny, L-Now, Pleny, Faafuu - 90% of as well as domestic. Both speedometer & pulse tracking connection are through 3.5 mm female jacks on the back of the monitor - adapters (NOT INCLUDED) might be needed if the device also happens to have FEMALE jacks (rare cases). 2. [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 particular models. 3. 2 x AAA Batteries Included. 4. Colour: Black. 5. material: plastic. 6. Package Contents: 1 x Exercise Bike Computer. Only the above package content, other products are not included. 7. 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.