Stopwatch with mute and light function, luminous electronic stopwatch professional training stopwatch for sports Style and size: 1010 light memory 30, appearance size: 81 x 62.3 x 21, 6 mm, display size: 36 x 23 mm. Mute and light function - The stopwatch has a silent and light mode, adjustable at will, absolutely silent, no BEEP. Let you use it at night. 30 memories - 1/100 second precision timer, to respond to the most basic movements. Multifunctional stopwatch - Light function, mute function, stop function, timer function, alarm function, clock function, countdown function, metronome, etc. Ergonomic design and large screen - Comfortable in the hand , cool look, clear and large digital display. Multi-function stopwatch, mute function, stop function, timing function, alarm function, clock function, countdown function, metronome , etc. Material: ABS Color: Black Function 1. Hour, minute, second, weekday, month and day, 2000~2099. 2. Memory 30 times, precision 1/100 second 3. Longest Chronograph: 9 hours 59 minutes 59 seconds 4. In clock mode, press and hold MODE for three seconds to turn on (off). 5. In clock mode, press and hold START/STOP for three seconds, sound on/off 6. Backlight: Press the backlight button (light button) to turn on for 4 seconds. 7. For more functions, please refer to the manual.