Material: Plastic

Length: 6cm

Volume: More then 10dB

Power Supply: One AG13X3 Battery

Color:Black?

Features:

1. 100% Brand new and high quality.

2. Powerful alarm beep.

3. Work on the study of human body balance.

4. Easy to use and comfortable to wear for a long time.

5. Just switch on the on-off， place it correctly behind ear then it will work.

6. Especially suitable for long-distance driving or night driving.

7. Wear on a ear， when your head nods forward in the degrees of 15 to 20 Centigrade ， an electronic position sensor will emit a loud alarm to instantly wake you and your passengers.

Package: 1 x Drive Alert