The Cel-Fi DUO+ (D32-2/4/12) is a powerful signal booster system that boosts T-Mobile 4G LTE voice and data. The Cel-Fi DUO+ offers up to 100 dB of gain and coverage up to 15,000 sq ft. The DUO+ covers Band 2, Band 4, and Band 12 for T-Mobile. It requires at least one bar of LTE signal where the network unit will be located. The Cel-Fi DUO+ system is very easy to set up. Anyone can install the device. No special tools or knowledge is required and there are no external cables, antennas, wires, or drills needed. The units simply plug-in...