Business is hard enough without the headache of lost signal, dropped, calls, and lagging downloads. Put HiBoost to work for you with our Commercial 12k. This amplifier is a state of the art, 2G, 3G and 4G cell phone signal booster. It covers a range of up to 12,000 square feet and boasts a +65 decibel max gain. If you want to boost a signal in a medium sized office building, the 12k should be your first pick.