Description:.Driver safety alarm to help prevent accidents caused by falling asleep at the wheel..Brand new anti-sleep alarm for drivers!.Perfect for anyone who needs to keep alert on duty, like drivers, guards, machine operators, and evenstudents.Safe for long drive and drive at night..Especially suitable for long-distance driving or night driving.It is guardian angel for drivers..Easy to use and comfortable to wear for a long time..Powerful alarm beep.Work on the study of human body balance.Alerts when the head loweren in the degrees of 15-20.Main Function: Anti Sleep Alarm.Alarm mode: Beep or vibration or beep and vibration.Weight:12.5g