Features: There are 2 types, with as/sm connection, chhose based on your needs. Both speedometer and pulse trakcing connection are through 3.5 mm female jacks on the back the monitor. Suitable for for Stationary Bikes with 'for head phone jack' look connection 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. Specifications: Material: ABS Connector: as/sm(optional) Input voltage: 1.5V Note: 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. Package includes: 1x Speedometer