2 large compartments. Set timer for up to 99 hours 59 minutes. Alarm setting period can repeat multiple times. Loud alarm beeps for 30 seconds. Brand new product with high quality. Set the time: 1. Press MIN for the number of minutes and HR for the number of hours. 2. Press START/STOP to start the timer.the LCD”:“will flash when the timer is counting. 3. To pause the timer,press button START/STOP,the LCD”:“stops flashing,press button START/STOP again,the timer will countdown the rest time. 4. When the set time is up,the timer will make out”beep-beep” alarm to remind you. 5. To cancel the last stting press buttons MIN and HR together. 6. To reset the alarm to go off at the same time period as on the last setting,press button START/STOP affer the countdown has completed.