Anti Doze Off Device For Drivers works on the principle of electronic balance and does not interfere with normal movements in the car. The alarm sounds only when the driver's head falls forward in drowsiness, simple but effective.
For example, if your normal driving position is with eyes and chin pointed down, the device can be set to tolerate that, but will sound if the chin drops below a certain level. A gravity switch inside the alarm monitors the position of the driver's head. Anti Doze Off Device is about the size of an external hearing aid and is lightweight