The nap alarm sleep warning device helps prevent fatigue related automobile accidents. Perfect for sleepy drivers or someone working the late shift and having trouble staying awake.

1. Sounds an alert to wake you up when your head falls forward
2. Rests comfortably over the top of your ear - small flexible design is comfortable to wear (approximately the size of an external hearing aid) and is fully adjustable
3. Comfortable even when wearing glasses

Specs: Three (3) LR41 button batteries included. Measures 2.75 inches x 2 x 0.5 inches