Portable Handheld Waterproof Digital LCD Stopwatch Chronograph High Precision Professional Sports Training Timer XJ-398 Portable Handheld Waterproof Digital LCD Stopwatch Chronograph Sports Professional Stopwatch Timer Counter with Strap Item Name: Multi-Function Digital Sports Timer Material: Plastic Color: Black/Yellow Powered by: AG13 Button Battery (included) Size (L x W x H): 9.0 x 6.45 x 2.0 cm Weight: 50g Quantity: 1 piece Operation: 1. Stopwatch Timing: In the normal running state, press the M key to use the stopwatch to enter the timing state. If the stopwatch display is not zero, press the D key to stop timing, and press the S key to reset to zero. 2. Display of Time, Calendar, and Alarm: In normal timekeeping mode, press the D key to display month, day, and week, and press the S key to display alarm time. 3. Setting Time and Calendar: Press the M key 3 times to enter time setting mode from normal operation. Seconds and time of day display will flash simultaneously. Press the S key to select minutes, hours, days, months, weeks, and seconds for adjustment. After adjustment, press the M key to return to normal timekeeping mode. Specifications: - High Quality Material: Durable plastic construction with reliable performance and waterproof design - LED Display: Shows hour, minute, second, AM/PM indicator, month, date, and day of the week - Hour Format Selection: Switch between 12-hour and 24-hour format - Alarm Clock Function: Includes alarm and hourly chime feature - Timing Accuracy: 6-digit display with 0.01 second precision Package Included: 1 x Multi-Function Digital Sports Timer Note: - 1 cm = 10 mm = 0.39 inch - Please allow 1–3 mm error due to manual measurement. Ensure you are comfortable with this before purchasing. - Due to differences in monitor displays, the image may not reflect the actual color of the item.