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 brandsOptional 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.