Selling price: Approximately 7,000 yen This is an easy-to-use alarm to prevent drowsy driving, simply worn on the ear. (Instructions for use are printed on the back of the box.) It alerts you when your head tilts. You can choose from three types of alerts: alarm, vibration, or alarm + vibration. It's a convenient and reassuring gadget that's easy to use, just by wearing it on your ear. It's a beautiful item, used for only about 5 days. I am selling it because I obtained a stationary type. There are no operational problems, and I have confirmed that it charges without issue. It has been disinfected with alcohol. Since it has been used very little, I think it's clean, but please consider purchasing only if you understand that it is a used item. It will be shipped via Yu-Packet Post.