Product description NOTE:With heart rate Works for HeadPhone-Look Cables Both speedometer and pulse tracing connection are through 3.5mm female jacks on the back of the monitor and adapters (NOT INCLUDED) might be needed if the device also happens to have FEMALE jacks (rare cases). Compatible with Most Indoor Exercise Bikes - for Stationary Bikes with 'head phone jack' look connection tips. E.g. many bike models by Sunny, PooBoo, L-Now, Snode, Exerpeutic, Pleny, Yosuda, Ativafit, Faafuu Optional Heart Rate Monitoring Feature An optional feature that works with bikes with pulse sensors (usually 2 x metal pieces on handle bars). Re-wiring MIGHT is required for some perticular models. 2 x AAA Batteries Not IncludedBatteries are NOT included. Detailed information: Model: ZT-JP040 Counting range: 9999 (pcs) Input signal voltage: 1.5V (V) Specification: SM connector Size: 147*124mm LCD Size: 50*23mm HG