When you drive, or learning, especially a coach, please use the driver sleepiness ear fluid. Usage is that prevent sleepiness ear fluid switch to "ON" position, hang it in your ears, once the drowsiness coming toward you, you are not sleepy, then the ear of the bell would send a clear and crisp "di" sound, let your spirits, so as to avoid the unexpected

Product Featuer:

Function:good for driver to avoid dangerous.
2.Material:plastic ABS.
3.100% brand new nap zapper anti-sleep alarm
4.Low power consumption
5.Powerful alarm beep.
6.Work on the study of human body balance.
7.Alerts when the head loweren in the degrees of 15° to 25°
8.Easy to use and comfortable to ware for a long time
9.Especially suitable for long-distance driving or night driving
10.ON / OFF switch
11.Powered by four AG3 button cell batteries(included)

More pic and details :

How it work ?

Step one  put a alarm on the right ear;

step two turn on the switch again;

step three irst check whether the alarm is set to normal, when to bring its position is not correct, sends out "beep" sound;

 step four  avoid high temperature and humidity storage.