Uniden UM50 4G Car/RV/Boat Cellular Booster Kit - Cell Amplifier Repeater Enjoy crystal clear phone calls & lightning fast data speeds; Guaranteed To Increase Your Cellular Signal - 60 Day Satisfaction Guarantee Eliminate missed and dropped calls & extend coverage to get rid of dead zones This kit is great for Urban & Rural environments on the road, in the trail or on the water Compatible with all carriers 3G & 4G networks (except Iden/Nextel) Supports Up To 20 Devices including smart phones, data cards and tablets