FeaturesWorks for HeadPhone-Look CableThe speedometer and pulse tracking connector are via 3.5mm jacks on the rear of the monitor - adapters (NOT INCLUDED) may be required if the device also has FEMALE sockets (rare cases). Compatible with most indoor bikes - for exercise bikes with "headphone jack", see connection tips. For example, many bike models from Sunny, PooBoo, L-Now, Snode, Exerpeutic, Pleny, Yosuda, Ativafit, Faafuu - 95% of Amazon brands as well as national brands Optional heart rate monitoring function A function optional that works with bikes equipped with heart rate sensors (usually 2 metal pieces on the handlebars). Some models may require rewiring. 2 AAA batteries not included - RequiredBattery NOT included. SpecificationModel: ZT-JP040 counting range: 9999 (pcs)Input signal voltage: Specification 1.5V(V): SM Connector Size: 147*124mmLCD Screen Size: 50*23mmTips: Please allow 1-3cm measurement error. Photo color may be slightly different from the actual product due to color display of different monitors. The product includes: 1x Speedometer Monitor.