Anti-Sleep Alarm is an innovative, potentially lifesaving anti-drowsiness / tiredness alarm. You just wear behind the right ear it works on the principle of electronic balance.It is worn over the ear and has an electronic position sensor. When your head nods forward, it sounds a loud alarm to instantly wake you and alert your passengers. The alarm when the internal sensors tilt forward by a certain degree. Not a soft, massage-like vibration, it's more like a "AH! Get this off me!" type that is sure to wake you up. This anti-sleep alarm is not only designed for drivers, it is also perfect for people who need to be fully alert while on duty, for example, security guards, machine operators and even students while studying or where concentration is required.