This unit was designed with drivers in mind. The NAP ALARM is a great solution for anyone that has ever felt like taking a nap while driving. This unit is worn over your ear and senses when the head nods forward. If this unit determines that you are falling asleep, then an alarm is sounded to alert you. The NAP ALARM is also perfect for those that need to remain alert for long periods of time such as security guards or students. Makes a great gift!