Tough And Durable: The SATZ heavy duty stopwatch is designed with hard usage in mind. The tough casing can withstand being dropped on the concrete floors of sports halls and PE classes. Let the kids use it without worrying if it will come back in one piece! Accurate Timekeeping: Measures to 1/100th of a second accuracy, and includes Lap, Splits, Chrono and Stopwatch functions. Easy To Use: Large chunky buttons make for easy operation, whether by teacher, pupil or parent. Suitable for a wide range of activities e.g. sprint times, match durations, laps, etc.. Versatile And Practical: Ideal for any activity, whether at school, at home or the swimming pool, or for clubs and activities. Easy-to-read digital display. Cost-Effective: It's durability means that it lasts longer, making this the choice for long-term cost effectiveness. Uses LR44 battery.