REARAND Driver Fatigue Alarm 3 in 1 Inside Sleep Alarm for Drivers Security Guards Nap Zapper Alarm Security Car Alarm System Drivers Security Guards

Got this for my elderly dad as a road safety measure. So far it works as he has a tendency to dip his head when he's not paying attention.Makes me feel safer when he uses it.The only negative thing is the short battery life. It needs to be charger between every drive.