Alerts you with a powerful beep when your head drops forward when driving Fits comfortably over your ear Designed with long journeys in mind Improve your safety with this device that will alert you with a loud beep if your head drops forward while driving. Ideal for long journeys when you can forget to take regular breaks making you more prone to tiredness. It is designed with long journeys in mind fitting comfortably over your ear so that you can wear it for long periods of time without feeling any discomfort. Supplied complete with 1 x LR44 battery Maplin Order Code FM28F.