High quality exercise bike monitor compatible with most stationary bikes. Designed for use with bikes featuring a headphone jack connectionplease check compatibility with your bike model. Fits brands such as Sunny, L-Now, Pleny, and Faafuu. 90% of both domestic and international models use this style. Speedometer and pulse tracking connections are made via 3.5 mm female jacks on the back of the monitor. Adapters may be required if your bike has female jacks (rare cases). Optional heart rate monitoring feature works with bikes equipped with built-in pulse sensors (typically two metal contact points on the handlebars). Rewiring may be necessary for certain models. Includes: 1 x Exercise bike computer, 2 x AAA batteries. Color: Black Material: Plastic Package includes only the items listed; other accessories not included. Note: Lighting and screen differences may cause slight color variations between the image and the actual item. Measurement tolerance is +/- 1-3 cm.