Phonetone Cell Phone Signal Booster for AT&T and T-Mobile | Up to 4,500 Sq Ft | Boost 4G LTE 5G Signal on Band 12/17 | 65dB Cellular Repeater with High Gain Antennas | FCC Approved

【Boost 4G LTE】- The booster is designed for MOST cell carriers - T-mobile and AT&T, boosts 4G LTE signal for all cellular devices operating on band 12 and band 17. Note: The booster only supports 5G band that largely deployed in current bands 12, 17 by Dynamic Spectrum Sharing by carriers. Please make sure your phone band shows band 12 or 17 before purchasing . 【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. 【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. 【Powerful Antennas & Large Coverage】- This booster comes wi