Features1Prevent Interference: Cycling computer anti interference, wireless induction, more convenient installation. 2With Luminous: The wireless cycling computer has a long lasting luminous, which is more dazzling and safer. 3Safe Use: Mountain cycling computer has an extension control line button, which is easy to control and safe. 4Light Control Design: The night light is upgraded from time control to light control, and intelligently upgraded. 5Water Resistant and Easy to Install: Life water resistant, without tool installation. 6Large Screen Display: Cycling speedometer temperature display function, low battery display, stopwatch function.SpecificationItem Type: Cycling ComputerMaterial: ABS, Electronic ComponentsSize:Stopwatch Head Size: Approx. 7.4 x 4.4cm/2.9 x 1.7inDisplay Size: Approx. 5.3 x 3.8cm/2.1 x 1.5inStopwatch Battery Type: Button Cell (Included)Battery Model: CR2032Number of Batteries: 2Battery Capacity: 210mAh/PcTransmitter Battery Type: Button Cell (Included)Battery Model: CR2032Number of Batteries: 1Battery Capacity: 210mAhPackage List1 x Speedometer1 x Transmitter1 x Magnet1 x Bracket (Including Button)6 x Cable Tie2 x Battery1 x Manual