?Reliable Service Guarantee?- FCC Certified, 30-day money-back guarantee, 3-month free replacement, 5-year manufacturer warranty, lifetime professional technical Support. ?Powerful Antennas & Large Coverage?- This booster comes with high gain directional antenna, allow you to point it to the nearest signal tower more accurate and get more signals, expanding the indoor coverage up to 4,500sq ft. DIY Installation. ?Better Data & VoLTE?- Enhances 4G LTE data speed signals and volte, enjoy faster uploads and downloads to stream videos smoothly in your house, office, cottage, cabin, camper, basement etc., get rid of expensive monthly internet fees. Supports multiple users simultaneously. ?Advanced Features & Smart Device?- The booster uses AGC(Automatic Gain Control) function, which can intelligently detect the existing signal strength, and adjust itself for best performance, then reflect its working condition through LED indicator. Buy it once, and boost for life. ?Ready for 5G?- The booster is designed for the largest cell carriers - Verizon and AT&T, boosts 4G LTE and 5G signal for all cellular devices operating on band 12, band 13 and band 17. Note: The booster only supports 5G band that largely deployed in current bands 12, 17 and 13 by Dynamic Spectrum Sharing by carriers. If you need a 5G cell booster, please ensure that you have a 5G phone and your carrier has deployed 5G in the 4G band of 12,13 and 17 before purchase.