High quality. Most exercise spin bikes use this monitor. For stationary bikes with a headphone jack connection, refer to connection tips. Compatible with bikes such as Sunny, L-Now, Pleny, and Faafuu. 90% of both domestic and international models use 3.5 mm female jacks on the back of the monitor for speedometer and pulse tracking connections. Adapters (NOT INCLUDED) may be required if the device has female jacks (rare cases). [Optional Heart Rate Monitoring Feature] An optional feature that works with bikes equipped with pulse sensors (usually 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: Light reflection and different display settings may cause slight color variations between the item and the image. Measurement error allowance is +/- 1-3 cm.