蓝色的车警报掩盖汽车警报

Specifications:1. 100% brand new nap zapper anti-sleep alarm 2. Low power consumption 3. Powerful alarm beep 4. Work on the study of human body balance 5. Alerts when the head loweren in the degrees of 15° to 20° 6. Easy to use and comfortable to ware for a long time 7. Especially suitable for long-distance driving or night driving 8. ON / OFF switch 9. Powered by fourLR41 button cell batteries(included) 10. Weight: 14g