http://5gstore.com/product/6588_cel-f... If you have an ADT alarm system for your home or business, there is a chance you also have a Safewatch Cellguard cellular backup system in place. This device is a white box with a cellular antenna that acts as a backup connection to your primary internet connection. If your primary internet connection fails, the Cellguard system takes over and runs your alarm over a cellular network. Everybody understands the importance of having an alarm system, and the benefits of the Safewatch Cellguard are many. The device works in the event of a power outage, lets your alarms function when your ISP is down or experiencing network issues, doesn’t rely on any phone lines, and gives you peace of mind that you’ll be protected 24/7. Something that many people overlook is the cellular signal available where the Cellguard will be installed. A cellular backup is great, but if there isn’t adequate signal available, how can it protect you? Enter the Cel-Fi PRO Signal Booster for AT&T. The Cel-Fi does away with all the complicated setup, issues, and installation costs of typical signal boosters. No mounting antennas to the roof, running cables through walls and ceilings, and no unsightly panel or dome antennas on the walls and ceilings. Instead the Cel-Fi PRO has just two pieces of hardware, a Network Unit (NU) and a Coverage Unit (CU). Installation is as simple as placing the NU in a window where the AT&T signal is the strongest and connecting it to power. The CU is then placed elsewhere in the home or office and connected to power. The NU picks up and amplifies the AT&T signal, wirelessly sends the signal to the CU, and the CU pushes out an amplified cellular signal for any devices in range. It is that simple! The Cel-Fi PRO will do double duty for you. First it will ensure your Safewatch Cellguard has a strong connection to the cellular network. This means your backup connection for your ADT alarm will be working for you 24/7. Even if it is installed in the center of a brick or metal building, it can be in the reach of the Cel-Fi. Because the Cel-Fi PRO covers up to 13,000 square feet there are very few places it can’t work for you. The second the job the Cel-Fi does of course is to boost the AT&T signal to other devices. AT&T phones, hotspots, and modems, along with the Cellguard, all benefit from an improved cellular signal. The Cel-Fi PRO isn’t limited to working with just ADT systems either. Any alarm system that uses the AT&T 3G, 4G, or 4G LTE network, can take advantage of a simple, zero installation way to boost the signal and provide the peace of mind knowing that your alarm system is working for you all the time.