High quality. Most exercise spin bikes use this monitor compatible with stationary bikes that have a headphone jack connection. Fits bikes such as Sunny, L-Now, Pleny, Faafuu, and others. 90% of home fitness bikes use this standard. Both speedometer and pulse tracking connections are made through 3.5 mm female jacks on the back of the monitor. Adapters (NOT INCLUDED) may be required if your bike 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. Re-wiring might be required for certain models. 2 x AAA batteries included. Color: Black Material: Plastic Package Contents: 1 x Exercise Bike Computer Only the above package content is included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.