★This is a junk item. This product is for those who can repair it themselves or use it for parts★ It's a Logitech MX Keys keyboard. The back key has come off and can't be reattached. From a layman's perspective, it seems the claw on the button side is broken. I don't know much about the main unit, so please check the photos. This is the best quality I can manage for the photos. The rubber button responds when pressed, so there doesn't seem to be any problem with the contact side. No claims and no returns accepted. Connectivity: Bluetooth