Portable Handheld Waterproof Digital LCD Stopwatch Chronograph High Precision Professional Sports Training Stopwatch 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 Qty: 1pc 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 travel time, press the D key to display the month, day and week, and press the S key to display the alarm time. 3. Setting the time and calendar: Press the M key 3 times to enter the time setting state in the normal travel state. The seconds and time of day displays flash simultaneously. Press the S key to select minutes, hours, days, months, weeks, and seconds as the adjustment objects. After the adjustment is completed, press the M key to return to the normal travel time state. Specifications: Features: High Quality Material:High quality with excellent performancelife waterproof LED Show:Show hour, minute, second, AM/PM indicator, month, data, and day of the week Hour Selection:You can select 12 or 24 hour user with this chronograph digital sports stop watch Alarm Clock Function:This chronograph stop watch with alarm and hourly chime function. Timing Accuracy: 6-digit display, accuracy 0.01 seconds. Package Included: 1x Multi-Function Digital Sports Timer Notes: Transition: 1cm=10mm=0.39inch Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you