【Works for HeadPhone-Look Cables】Both 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 Feature】An 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.