High quality monitor compatible with most exercise spin bikes. Designed for stationary bikes with a "headphone" look connection tip. Fits models from brands such as Sunny, L-Now, Pleny, Faafuu, and others. 90% of home-use bikes use this type of connection. Both speedometer and pulse tracking connections are made through 3.5 mm female jacks on the back of the monitor. Adapters may be required if the device has female jacks (rare cases). [Optional Heart Rate Monitoring Feature] This optional feature works with bikes equipped with pulse sensors, typically two metal contact points on the handlebars. Rewiring might be necessary for certain models. Includes 2 x AAA batteries Color: Black Material: Plastic Package Contents: 1 x Exercise Bike Computer Note: Only the items listed above are included. Other products are not part of this package. Light reflection and differences in display screens may cause slight color variations between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.