Features: Works for HeadPhone-Look CablesBoth speedometer & pulse trakcing connection are through 3.5 mm female jacks on the back the monitor - adapters (NOT INCLUDED) might be needed if the device also happen 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 - 95% of Amazon brands as well as domestic brands Optional Heart Rate Monitoring FeatureAn optional feature that works with bikes with pulse sensors (usually 2 x metal pieces on handle bars). Re-wiring MIGHT be required for some perticular models. 2 x AAA Batteries Not Included - RequiredBatteries are NOT included. Specification: Counting range: 9999 (pcs) Input signal voltage: 1.5V (V) Specification: SM connector Size: 147*124mm LCD Size: 50*23mm Tips: Please allow 1-3cm error of measurement. Photo color might be a little different from the actual product due to color display of different monitors. Product Includes: 1x Monitor Speedometer