Wireless bicycle computer is simple to use, durable, and full of convenient features ClickTec Plus single button design is intuitive and convenient, letting you scroll between display functions easily ID-coded wireless data transmission tracks data for two bikes via one computer unit; large screen simultaneously displays speed, time, and altitude functions Current speed to 65 MPH, total distance to 999,999 miles, two trip distances to 9,999 miles, elapsed time to 99:59:59, average speed to 65 MPH, and maximum speed to 65 MPH Dual tire size settings, 27-inch transmission distance, computer and sensor run on CR2032 X1 battery; measures 34 by 57 by 15 millimeters (W x H x D); 30-gram weight