Wakey wakey avoid nodding off with this nap alarmr designed to help keep you awake and prevent unwanted nappingr loud alarm goes off when your head tilts forward alerting you and othersr worn over the ear electronic sensor monitors head positionr potentially handy for drivers security guards machine operators students and morer easy to use with onoff switchr black unit made from plasticr includes button batteryr save 83 with a motion activated nap alarm