The OEM Ring Quick Release Rechargeable Battery Pack is a black power supply designed specifically for Ring video doorbells and cams. It is compatible with models such as Ring Video Doorbell 4, Ring Video Doorbell 3, and Ring Video Doorbell 2. With dimensions of 3.5 inches in height, 1.3 inches in depth, and 2.3 inches in width, this battery pack offers a convenient and rechargeable solution for keeping your smart doorbell powered up and ready to use.