Wilson Electronics Sleek 4g Kit - Retail Packaging - Black (Discontinued by Manufacturer) Cellular Signal Amp For Use In Any Vehicle Provides Significant Signal Improvement For Any 4g Or 3g Cellular Phone Or Data Device Provides Stronger Cellular Signal For All U.s. Cellular Carriers Amplifies Signals To & From Cellular Tower-provides Usable Signal In Weak Signal Areas Moves Easily Between Vehicles