Battery: AG13 button cell, replaceable Weight: 0.07kg Single color box packing size: 9.7 x 6.7 x 2.5 cm. Function: andnbsp; 1. Normal travel time, display month, day, week, hour, minute, second; andnbsp; 2. 12 o'clock; andnbsp; 3. Daily timed alarm; andnbsp; 4. 1/100 minute timing; andnbsp; 5. Plastic shell; Professional running timer is made of high quality ABS, smooth material and beautiful appearance Electronic trainer chronograph for various occasions such as running, swimming , rowing, etc. The stopwatch is designed to calculate time and test speed for break or break times in various sports This electronic stopwatch display is a durable and popular stopwatch for basic timing needs Settings usage instructions: 1 Stopwatch setting and usage: Under the normal time display, press the MODE button once, you will see the status of the stopwatch , press the START button (right button) again to start timing, you need to stop and press the START button again, and continue. to press the START button again. To reset the time to zero, when the stopwatch is stopped, press the SPLIT key (left soft key) to reset the time to zero. 2 Setting the alarm time: under the normal display of the time, press the MODE button twice, you will see it enters the alarm time setting state, then press the START button (right button) continuously to start setting, press Press the SPLIT button (left button), will be transferred to the notation. 3 Time Setting: Under the normal time display, press the MODE button three times, you will see the seconds flashing, press press the SPLIT button (left button), you will see the score flashing, then press the START button (right button) to After setting, press the SPLIT button (left button) you will see the hours flashing, then press the START button (right key) to set the hours, press the SPLIT key (left key) to see the days flashing, then Press the START button (right button) to set the number of days, perform the same operation, etc. After setting the number of months and weeks, press the MODE button to exit.