SureCall EZ 4G Plug-and-Play Cell Phone Signal Booster Kit for All Carriers 3G/4G LTE Sets Up in Minutes - Simple Plug-and-Play Install Boosts Voice, Text and 4G LTE Signals for All North American Cell Carriers Reduces Dropped & Missed Calls Supports Multiple Users Simultaneously Please note: coverage area will vary based on existing signal at the window location 1-2 Bars ~500 sq ft, 3-4 Bars ~1000 sq ft, 5 Bars ~2000 sq ft