◆ Product Description Tested and working. Are you missing your receiver? You will need to pair it with your Logitech product (mouse, keyboard, etc.) to use it. Logitech wireless mice are paired with the Unifying receiver included at the time of purchase, and the mouse will be recognized and usable when the receiver is attached to the main unit. However, when connecting to a Unifying receiver other than the one purchased, pairing with the Unifying receiver is not complete, and connection settings with the Unifying receiver are required. ★ The product itself has no noticeable scratches or stains and is in good condition.