Thank you for viewing! This is a set of 3 units. I think I used them about 10-15 times as intercoms. I am selling them because I bought new intercoms. The regular price is ¥5480. I am selling them because I have no use for them. ■ Product Overview Model Number: 400-BTMH023BK Product Name: Bluetooth Mono Headset - Bluetooth Version: Bluetooth 5.0 - Continuous Talk Time: 20 hours - Microphone Type: Single-directional microphone - Microphone Mute Button: Yes, flexible arm - Charging Method: Wireless charging - Includes charging cradle (Type-C). I will add one extra unit, for a total of 4 units. - Single-ear (compatible with both right and left ears) - Over-the-head type ■ Condition: Used. There may be some minor scratches and dirt that are not noticeable. Please be sure to check the images as the items have been opened. ■ Other: - The box in the image will be simply packaged for shipping. Please be aware of this. Please consider purchasing after understanding the above conditions!