The timer is ready for use immediately after inserting the battery, the time is entered by minute and second button, the countdown begins of course with the start / stop button. By pressing both buttons the set time period is deleted.
After the time a typical alarm clock beep as it is built identically in many inexpensive radio alarm clocks will sound.
The set time is fortunately after the countdown is maintained and does not need to be readjusted again if the same time to be counted again.
One shortcoming is the cheap-looking tone that sometimes irritated because you think you hear an alarm clock ringing.
Plus point is the large display, which is easy to read even from a distance, or for people with visual impairments.