Premium Nap Zapper Driver Alarm Nap Zapper (Driving Alarm or Doze Alert) is an Anti Drowsy Alarm designed to raise drivers awareness of momentary lapses caused by sleepiness and tiredness Wear behind the ear it works on the Principle of Electronic Balance As the drivers head nods below a preset angle it emits a loud alarm signal alerting the driver to take corrective section Place behind your right ear and adjust it should be placed correctly for effectiveness When the device is no longer required more the lever towards the word OFF