A. Features: There are 2 types, with as/sm connection, which can be chosen based on needs. Both speedometer and pulse tracking connection are through 3.5 mm female jacks on the back of the monitor. It is suitable for stationary bikes with 'for head phone jack' look connection tips. For example, bikes by Sunny, PooBoo, L-Now, s node, etc. 2 x AAA Batteries are required but not included for safety concern. It has a large LCD display, and the data can be clearly seen at a glance, which is convenient for reading. B. Specifications: Material: ABS Connector: as/sm (optional) Input voltage: 1.5V C. Note: There may be an error of 1 - 3cm due to manual measurement. Please make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not show the actual color of the item. D. Package includes: 1x Speedometer