SXJ504 Sport Stopwatch Timer for accurate time keeping. 1 button function for start, stop, reset to keep accurate time Ideal for sports referees and fitness enthusiasts, this stopwatch has high precision features to meet your timing needs This movement contains 13 jewels and can maintain normal operation even in the temperature range from -10℃ to +40℃ Ideal for sporting events, swimming competitions and fitness training, the SXJ504 stopwatch is a reliable tool for all sports activities Designed to withstand the toughest conditions, this mechanical stopwatch is waterproof, shockproof, and corrosion-resistant, ensuring durability in a variety of environments