1. Stopwatch, support 99 minutes 59 seconds 99 milliseconds timing; 2. Timing, support 99 minutes and 59 seconds timing. You can set the time to stop when counting up, start counting from 0, and stop automatically at the set time. 3. Countdown, support 99 minutes 59 seconds countdown. 4. Clock function. Support 12/24 hour switching display. H1 stands for 24-hour display, and H2 stands for 12-hour display. Different display modes can be switched by remote control; 5. Alternate timing. This function is also the main function of this clock. Users can use it to set the timing of daily fitness activities. Alternately count training time and rest time. The training time is represented by F, and the rest time is represented by C. C C is the number of repetitions, and each group of timing can be kept on different shortcut keys. TABATA key: 8 groups of exercise time F1-F8, interval time C1-C8, exercise time 20 seconds, interval 10 seconds, this key is a fixed program, press this key, click to start FGB key: Press FGB once to enter F1 mode, run for 5 minutes, with an interval of 1 minute, and run 5 times; press FGB twice continuously, enter F2 mode, run for 5 minutes, and run 3 times with an interval of 1 minute EMOM key: This key is a fixed program key, which is a one-minute countdown, click to run and count down from 60 seconds. 10Sec button: Press this button once for 10 seconds of preparation time to cancel the 10 seconds of preparation time, and enter the timing mode directly when the timing starts The display brightness is adjustable, five levels of brightness 6-digit display: 2 green + 4 red Installation method:placing/hanging Visual range:Less than 20M Digits height:40mm Power supply mode:USB plug-in Occasion:fitness center/boxing center/match timing/training Plug Type:US Plug, it appl