Simply attach the computer, with large LCD display, to your handlebars, the transmitter to the fork of your front wheel and away you go. Thery are easy peasy to install as there are no fiddly wires to fit, and is packed with features - everything you would like to know when competing, training or simply exercising. Features include a speedometer with average and maximum speed, auto trip and total trip distance, auto trip timer, speed comparator and tendency, Km or mile selection and auto power off. Package includes everything you need to fit the unit to your bike and includes batteries..