Bike Speedometer for Indoor Bicycle Speedometer Wired Cycle Bike Computer Multi-Function LCD Display Heart Rate Tracker 40JEOOTDTY Features: There are 2 types, with as/sm ion, chhose based on your needs. Both speedometer pulse trakcing ion are through 3.5 mm female jacks on the back the monitor. Suitable for for Stationary Bikes with ''head phone jack'' look ion tips. E.g. bikes by Sunny, PooBoo, L-Now, s node, etc.2 x AAA Batteries Not Included - Required: Batteries are NOT included for safety concern. Large LCD display, the data is clear at a glance, which is convenient for read. Specification: Material: ABSConnector: as/sm(optional)Input voltage: 1.5VPackage Includes: 1x Speedometernote: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.