5-Band Cellular Amplifier The Super HALO is a marine grade 4G, 3G and 2G voice and data cellular reception solution. Its 5-band compatibility makes it compatible with AT&T, T-Mobile and Verizon networks. The Super HALO is optimized to boost cellular reception for your boat, car, recreational vehicle, home or Anywhere® else, with support of 7+ users simultaneously and an indoor antenna to direct the signal where you really need it. 5-Band amplifier works with AT&T, T-Mobile and Verizon 4G, 3G, & 2G in the US and other major Canadian networks. Works on 7+ devices simultaneously. Compatible with phones and mobile hotspots. Automatic gain control (AGC) adjusts without dials allowing for an easy installation. High quality marine grade materials and design. FCC certified. Automatic gain control and shutdown does not allow interference with the cell towers.