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[HEAD TILT DETECTION] This ear worn sleep alarm detects changes in head tilt within about 15° to 25° and sounds an alert when your posture exceeds the safer range during driving or upright work. [AUDIBLE WARNING] Built with a clear sound alarm mode this driver reminder gives a timely wake up alert to help reduce drowsy moments during night driving long trips duty shifts or guard tasks. [LIGHTWEIGHT COMFORT] Made of plastic and weighing only 14g this compact black alarm is easy to wear for extended periods and portable enough to carry in cars taxis trucks RVs or work bags. [SIMPLE TO USE] The one touch design makes operation quick and easy with no app or complex setup required making it practical for drivers night broadcast staff security personnel and shift workers. [PORTABLE SAFETY TOOL] Sized at about 6 x 5.5 cm and powered by 4 AG3 batteries this compact warning device offers dependable daily use and stores easily when not in service.