superbars cell phone booster for home, 6,000 sq ft with 2 indoor antennas, app remote monitor, all u.s. carriers -verizon, at&t, & more, fcc approved superbars superbars 4k pro innovative cell phone signal boosters the barsguard 4k pro's powerful boosting capabilities easily cover a range of 3,000~6,000 square feet with two indoor antennas, and boasts a 65+ decibel max gain. now with our latest new technology you can remotely monitor and troubleshoot your device using our signal supervisor app. superbars brings these features formerly reserved for industrial signal boosters to your home or office. after pairing your cell phone or tablet to your superbars signal booster you can easily troubleshoot and adjust settings without any hassle. how our phone boosters work the donor antenna receives the radio waves sent by your carriers’ cell tower. it then takes that signal into your building or vehicle through a low-loss coaxial cable. once indoors it is fed to the booster which amplifies the signal and runs through to your indoor antenna where it transmits your now boosted signal throughout your home or office.