The Robic M457 Clipboard with Calculator and Stopwatch helps you organize your athletic training with precision. Equipped with a full-function memory calculator and stopwatch, this handy clipboard set will keep you right on track. Times single events and multiple splits Includes ruler and straight edge Includes LR1130 battery; solar power backup One year manufacturer’s warranty Dimensions: 9L x 4W inches For timing and calculation purposes. Convenient clipboard for taking notes. Full-function calculator with memory feature. 1/100-second precision stopwatch. Calculator and stopwatch can operate simultaneously. Battery Life: 2 years.