1. Shutdown function: power can be turned off without resetting the clock (most stopwatches on the market do not have this feature). 2. Key mute function: allows silent operation suitable for quiet environments. 3. Time and calendar display: shows year, month, day, hour, minute, second, weekday; 12/24-hour format selectable. 4. Stopwatch function: three-line display with split memory storage; precision up to 1/100 second; maximum time 9 hours 59 minutes 59 seconds; displays fastest, slowest, and average lap times; memory data can be scrolled through easily; all functions are user-friendly. 5. Countdown timer:可设置倒计时功能，最大 countdown time is 9 hours 59 minutes 59 seconds. 6. Daily alarm function: quick on/off alarm control. 7. Metronome function: adjustable beat frequency from 5 to 320 beats per minute in 5-beat increments; includes count-up feature. Product Name: Stopwatch Color: White Material: Plastic Package Contents: 1 x Stopwatch (includes CR2032 button battery) – other items not included. Note: Lighting and display differences may cause slight color variations between image and actual product. Measurement tolerance: +/- 1-3 cm.