NOTE: With heart rate monitoring. Works with headphone-jack style cables. Both speedometer and pulse tracing connections are through 3.5mm female jacks on the back of the monitor. Adapters may be needed if the device has female jacks (rare cases). Compatible with most indoor exercise bikes that have a headphone-jack style connection. Examples include bike models from Sunny, PooBoo, L-Now, Snode, Exerpeutic, Pleny, Yosuda, Ativafit, and Faafuu. Optional heart rate monitoring feature works with bikes equipped with pulse sensors (typically two metal contact points on the handlebars). Rewiring may be required for certain models. Uses 2 x AAA batteries (not included). Detailed information: Model: ZT-JP040 Counting range: 9999 (pcs) Input signal voltage: 1.5V Specification: SM connector Size: 147 x 124mm LCD Size: 50 x 23mm