The Shark X6 is the highest power 53db gain Marine booster on the market. It 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 Marine X6 Extreme Power Booster is the most technologically advanced wireless cellular signal booster made. It features proprietary "stealth tech technology" that prevents shutdowns from poor antenna placement and changing environment. This booster has 53dB of gain and provides coverage throughout your vessel. The Shark X6 can keep you connected up to 30 mi. (50km) from the nearest tower.