All ETC computers feature an Auto ON/OFF function and auto Start/Stop to extend battery life. They are also rainproof so you can use them in all weathers. There are 3 models in the range, from an entry level 6 function to an 8 function wireless computer. Set up is straight forward with easy to follow instructions. All batteries and brackets are also included.Features:Wireless Computer so no cable between wheel sensor and computerMeasures - Current Speed, Timer, ScanMeasures - Trip Distance, Odometer, ClockMeasures - Max Speed and Average Speed..