· Powerful alarm beep · Work on the study of human body balance · Easy to use and comfortable to wear for a long time · Just switch on the on-off, place it correctly behind ear then it will work · Especially suitable for long-distance driving or night driving · Powered by four AG3 button cell batteries(included) · Ergonomic Design - fits around back of ear · 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. · An anti-sleep alarm designed to raise drivers awareness of momently lapses caused by sleepiness and tiredness. · A perfect choice for people who need to be on full alert while on duty such as security guards, machine operation and even students who need to work on their posture. · New in original retail package. · Size:5 X 6 X 1.5cm/1.97 X 2.36 X 0.59in · Material:ABS
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