The mobile x1 is the highest power booster on the market and will keep you connected where other boosters fail. It boosts signal to all cell phones and cellular devices within the booster's range simultaneously. This is a wireless booster that does not require a physical connection to the cell phone or cellular data device. The smoothtalker mobile x1 high power booster is the most technologically advanced wireless cellular signal booster made. It features proprietary "stealthtech technology" that prevents shutdowns from poor antenna placement and changing environment. This booster has 50db of gain and provides coverage throughout your car, truck, rv or boat. Comes with a 14" high gain magnetic mount antenna that provides best performance in flat terrain. The 3g,4g signal booster covers the following cellular frequency bands: band 5 / 850mhz, band 2 / 1900mhz