Easy to use, four-sided flip display, clockwise flip clock, DIY custom any minute timer, 5-minute timer, 25-minute timer, all timing start or pause is realized by shaking the product, no button operation in the whole process, free Go to your tedious setup time. Four reminding modes: alarm + vibration + flashing backlight, alarm + flashing backlight, vibration + flashing backlight, flashing backlight, four modes can satisfy your use in various situations without disturbing others. DIY self-defined timer, you can freely set the time from 0 to 99 minutes according to user habits, the time system will automatically save the setting, and the next time it is used, it will default to the last time set. If you need to change the DIY time, press this button to reset it manually. This function can meet any timing needs and saves the trouble of repeatedly setting the time. Long press the S/S button to shut down, and all settings will remain unchanged after shutting down. Long press this key to save all settings used last time after turning on. This function is convenient to carry and solves the trouble of accidental triggering when carrying. Two AA batteries are required (no included).