EZON GPS Sports Watch Outdoor with Distance Pace Alarm and Calorie Counter for Men T031A01 Black GPS watch, GPS is global positioning system, the watch has a GPS receiver, It can measure exercise distance, exercise speed etc. when you do exercise, it is also have alarm, exercise distance, exercise speed, count up timer, lap timer, calories burned, stopwatch, etc. The watch can save the last 10 exercise records Inbuilt GPS module, help correct the time automatically, please refer to the city code table on manual to select city code accurately, because the watch will rest time by GPS according to the city you have set when the GPS is activated This GPS watch is with alarm function, if the alarm is turned on, the watch will chime for about 20 seconds while reaching the alarm time. You can stop the chime using any button The maximum of stopwatch measurement is 99 hours 59 minutes and 59 seconds. It has two ways to measure: count up timer and lap timer This watch is with backlight, the screen will remain illuminated for about 5 seconds GPS Watch: Build-in GPS technology keeps track of your distance, speed, pace. Fitness Tracker: Tracks your workout, distance, calories burned and activity. The GPS measures your speed and distance from the movement of your wrist. The symbolRunning manappeared on the screen means the GPS is activated. In the time mode, press button[E] to enter the time mode. In the GPS mode, press button[B] to return to the time mode. In the GPS mode, press button[E] to scroll through the following views: current time, total distance, current pace, total duration, current speed, calories burned, etc. The maximum of stopwatch measurement is 99 hours 59 minutes and 59 seconds. It has two ways to measure: count up timer and lap timer. It can measure and record exercise time in the measuring range of 99:5959. And you can cycle review laps time, total time, best lap and average lap time record. In the time mode, press button to enter stopwatchmode (the watch will display the mode mark for two seconds, then enter the stopwatch mode), or press button[D] twice to enter stopwatch mode. Count up timer is available to measure the running time of one athlete.While running or racing on the track, you can use lap timer to measure each lap time and total time. This watch can save up to 30 laps data. This Watch can record and calculate the data of how long you keep doing exercise, the consumption of the calorie, the BMI index and the speed distance and so on when you exercise. You can make reasonable adjustments which make your sports more efficient and specific according the data. The lithium-manganese battery CR2032 is about 22 months life in the standby mode. About 16 months when you turn on pedometer periodically. It is easy to buy and replacement.