Driver Anti Sleep Reminder Car Safe Driving Sleep Alarm Device Hanging On Right Ear(Black) Features: Place the alarm on the right ear and open the switch to check if the set alarm is appropriate. When it is not properly positioned, it will sound a "beep" to remind you. Compact and lightweight, it is easy to carry and use. Exquisite and considerate design, fit for your right ear perfectly. Constructed with ABS material, durable in use. 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. Specification: Condition: Material: ABS Battery specifications: AG13X3 (Universal Button Battery) One battery service life is about 6 months - 24 months. Instructions: 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. Package List: 1 * Anti-Sleep Reminder Note: 1. 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. 2. Avoid high temperature and wet storage.