Are you a driver who often drives late at night and fears falling asleep at the wheel, I will recommend something perfect for you.
you could keep yourself from getting drowsy with this great gadget. Turn the power on, and wear it on your right or left ear. When you are about to fall asleep with your head lowered, it emitts "Bi-Bi-" alarm; There is no sounds emitted when you keep normal driving status with eyes looking forward.
Very user-friendly!
This gadget only costs $1.99 on sinamalls.com
Free shipping, dirt-cheap!
I bought two, one is for myself, another is for my dad.