Specifications‎:‎Nap alarm is an innovative‎,‎ potentially lifesaving anti‎-drowsiness alarm‎.‎ 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 nap 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.‎Easy to use and comfortable to ware for a long time‎.‎Alerts when the head loweren in the degrees of 15° to 30°‎.‎Especially suitable for long‎-distance driving or night driving‎.‎ON/OFF switch‎.‎Powered by 3 button cell batteries‎(‎included‎)‎‎.‎Type‎:‎ Nap AlarmMaterial‎:‎ ABS‎,‎ Metal‎,‎ Electronic ComponentColor‎:‎ Pink‎,‎ Yellow‎,‎ Black‎,‎ Sky Blue‎,‎ White‎,‎ Sent by RandomFit for‎:‎ Student‎,‎ Driver‎,‎ Operator on Duty‎,‎ etcFeatures‎:‎ Anti Sleep‎,‎ Keep Awake‎,‎ Drowsy AlarmSize‎:‎ 5cm x 6cm x 1.5cm/1.97‎"‎ x 2.36‎"‎ x 0.59‎"‎ ‎(‎Approx‎.‎‎)‎Notes‎:‎Due to the light and screen setting difference‎,‎ the item‎'‎s color may be slightly different from the pictures‎.‎Please allow slight dimension difference due to different manual measurement‎.‎The color and style of the item will be sent by random‎.‎