High quality exercise monitoring device used with stationary bikes featuring a headphone-style connection. Compatible with various brands, this monitor is suitable for a wide range of exercise spin bikes. Both the speedometer and pulse tracking functions connect via 3.5 mm female jacks located on the back of the monitor; adapters (not included) might be necessary if the device has female jacks (rare cases). [Optional Heart Rate Monitoring Feature] This feature works with bikes equipped with pulse sensors (typically two metal pieces on the handlebars). Some specific models may require re-wiring. 2 x AAA Batteries Included Color: Black Material: Plastic Package Contents: 1 x Exercise Bike Computer Only the listed items are included; other products are not part of the package. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement errors allowed are +/- 1-3cm.