Product Condition: * The main unit has only been used a few times and is in very clean condition overall. * The goggle attachment (goggle-related item) is unused. * Operation has been confirmed, and it works without any problems. Product Description: The Polar OH1 is an optical heart rate sensor that can be worn on the arm or temple to accurately measure heart rate. It supports a wide range of sports, including running, gym training, cycling, and swimming. It's compact and comfortable to wear, making it recommended for those who dislike chest straps. Accessories: * Polar OH1 main unit * Armband * Goggle attachment (unused) * USB charging adapter * Original box (please specify if included) *Please understand that this is a used item before purchasing.