Easy To Use-Long press switch to turn on productivity timer,short press switch about 1 second after turn on the pomodoro timer then can change ringing/vibrating mode.filp to timer make the preset time (number) face up,timer will be countdown automatically.the LED light will keeping lighting in the entire process and blinks to alert 10s before countdown end.if need to reset new time only need to filp timer again. 11 Preset Time-Productivity cube provides 1 / 3 / 5 / 10 / 15 / 20 / 25 / 30 / 45 / 60 / 90 minutes total 11 time presets, in accordance with length of the activity to flip the cube timer to the preset time that you want, less time setting compare with ordinary timer.it's more simple and more easy.perfect for learning, cooking, reading, exercise, brushing teeth and etc. Typc Charging- Desk timer for productivity has a rechargeable battery and USB-C charging port, don't have to replace the battery,to avoid waste valuable time and money to buy extra batteries,task timer has an LED indicator to indicate power situatio, red light (low power), blue light (full power), Allow us grasp the status of the timer at a glance.