The ADT "CellBridge" Alarm System Upgrade Unit is a wireless unit that allows you to upgrade your 3G to 4G connection for improved security. It features a 24-hour backup power source, making sure your alarm system remains functional even in case of an outage. This new in box unit is in white color and is compatible with ADT smart home systems. With a sleek design and reliable features, the CellBridge Upgrade Unit is an essential component for maintaining a secure home environment in the year 2020.