Features: Accuracy engineered mechanical stopwatches ensures minimal timing errors with a stainless steel spring, 13 jewelry movement, and shock resistant design for reliable sports chronograph performances. Features a manual start/stop mechanism, 30/60 second dials with high contrust pointers, and operates flawlessly in 10°C to 40°C environment without batteries. Used by coaches, referees, and athletes for professional track event requiring handheld stopwatches accuracy. Ideal for timing sprints, races, and training drills during outdoor competitions or indoor gym tasks. Combines classical mechanical durability with modern splashes resistant protections, featuring glowing markers for low light readability in critical sports scenario. Specifications: Component:Metal Size:Approx,60×50×26mm/2.36x1.96x1.02inches Type:504/803/806/807(Optional) Package Includes: 1Pc Mechanical Stopwatches note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color. Thanks!