Functions1. Clock: 24-hr system2. Count-Up/Countdown/Loop Countdown: All max to 99 hrs 59 min 59 sec3. AlarmPrompting Mode1. Prompting Time: Prompt for alarming/countdown will last for 1 min. Press ST/SP button to end it. Loop countdown reminder prompts 1 sec in 10 sec (2 s in 10-29 s, 3 s in 30-59 s, 10 s in 1 min and above).2. Three Prompting Ways: Loud Sound + Flashlight(Fl), Low Sound + Fl, Mute + Fl.Note: There are 6 prompting ways under vibration mode.Application MethodOn & Off: Enter clock mode (CLOCK appears in the right corner), hold SET button and press ST/SP button to turn it off. Press any button to turn it on.Vibration On/Off: Press H & M button at the same time under clock mode to turn on/off vibration.Clock: Enter clock mode, hold SET button for 2 s until time flashes, then press H/M/S to set hr/min/sec. Press SET button to confirm.Count-Up: Enter timer mode (Hourglass mark appears in top right corner) with time shows zero. First press on ST/SP button to start counting up, and second press to pause. Under pause status, all times will be reset if press H & M simultaneously.Countdown: Enter timer mode with time stops or shows zero. Setting/reset method is the same as Clock & Count-Up. It will begin to count up with 1 min prompt when countdown ends. Press ST/SP button to turn off the prompt and restore params.Loop Countdown: Enter timer mode, hold the SET button for 2 s to turn the Loop on/off (Loop mark appears in top middle). Setting/reset method is the same as Countdown.Alarm: Enter to alarm mode(Alarm mark displays in the top left corner) and refer to the setting way of Clock. Press ST/SP button to turn on/off. There will be bell reminder icon in the top left side.Reminder: Use with 2 AAA7 batteries. Replace the batteries if display is blurred or sound is weakened.