Thank you for viewing. This is a Garmin arm band-type sleep monitoring device. I purchased it new online and used it 5 times. There are no noticeable scratches or stains. The device also worked without any problems. I am selling it because I will be using a different sleep measurement device. I will send everything that came with the purchase, including the box, instruction manual, and charging adapter. * Brand: GARMIN * Model Name: INDEX SLEEP MONITOR * Armband Size: L/XL * Color: Black * Retail Price: 27,800 yen * Included Items: Main unit, armband, charging cable, instruction manual, outer box, inner box, warranty card