Features: 1.Both speedometer & trakcing connection are through 3.5 mm female jacks on the the monitor - adapters (NOT INCLUDED) might be needed if the device also happen to have female jacks (rare cases). 2.An optional feature works with bikes with sensors (usually 2 x metal pieces on handle ). Re-wiring MIGHT be required for some perticular models. 3.Anti-glare Lcd:Anti-glare LCD which can be clearly viewed at all angles in sun full-screen white backlight night riding can clearly see the data no matter under the sun or night riding never worry the darkness. 4.Multi-functions:Small size light weight makes it convenient and durable. This bike speedometer works well to measure speed distance riding time and etc. It fits better for serious bicyclist or fitness fanatic to record and manage the cycling data in the training. 5.After-sales Service:If you have any problem please contact us immediately we will help you solve it as soon as possible. Specification: Material:plastics includes: 1*Exercise Bike Heart Rate Tracker