Features:
Put it behind your right ear, Alerts when the for head lower in the degrees of 15° to 20°.
Especially suitable for long-distance driving or night driving.
Driver safety alarm can help prevent accidents caused by driver's sleep when driving.
Examine whether it is in the normal :it beeps when you are leaning your for head forward and makes no sound while sitting straight , it is at normal state.
It is suitable for a wide range of people, such as night shifts, door guards, guards, television stations, radio stations, night broadcasts of check-in personnel, and security personnel.

Specifications:
Material:Plastic
Size:Approx.7.5x5cm/2.95x1.97in
Net Weight:23g

Note:
Please allow 1mm errors due to manual measurement.
Due to the difference between different monitors, the picture may not reflect the actual color of the item.

Package includes:
1x Anti-Sleep Alarm