[Easy to Use] Press and hold the switch to start the productivity timer, and short press the switch for about 1 second after starting the productivity timer to change the ring/vibration mode. Turn the timer over so that the preset time (number) is facing up and the timer will automatically count down. The indicator light stays on throughout the process and flashes as a reminder 10 seconds before the countdown ends. If you need to reset the new time, just turn the timer over. 11 Preset TimesProductivity Cube provides 1 / 3 / 5 / 10 / 15 / 20 / 25 / 30 / 45 / 60 / 90 minutes total 11 time presets, switch the cube timer to the preset position you want according to the duration of the activity, less time settings compared to normal timers. It's simpler and easier. Perfect for studying, cooking, reading, exercising, brushing your teeth and more. RING TONE + VIBRATION REMINDER Focus timer provides ring tone/vibration mode choose the right mode according to the time and location avoid the timer ringing to disturb others especially in some quiet places such as offices or libraries (vibration mode) we recommend to use the ring tone mode when the item needs special attention or urgent.