Material: ABS Packing size: about 12X7.5CM/4.72*1.85in
Product Features: 1, Bring the alarm on the right ear; 2, Then turn on the switch; 3, Check if the alarm set is proper. When it is not properly positioned, it will make a “beep” sound to remind you. 4, Avoid high temperature and wet storage.
Usage: Switch the anti-sleeping alarm to the "ON" and hang it on your ear. Once you can't help but fall asleep, the ear bell will emit a crisp “beep” sound, which makes you feel refreshed to avoid accidents. It can also be used for students at home, sitting in the wrong position during homework. A beep will sound to remind the students.
Instructions: Open the switch and hang it on your ear. Adjust the angle on your ear according to your sitting position until you adjust to the driving position you are most accustomed to. Unscrew the screws on the cover when changing the battery, and open the rear plate.