SmoothTalker Stealth X2 72db 3G Extreme Power Cell Phone Signal Booster for Home & Office Recommended for locations greater than 6 miles and up to 30 miles from the nearest cellular tower Features automatic oscillation control, and network overload protection to maintain optimum performance at all times. This 3G,4G,LTE Signal Booster Kit covers the following Cellular Frequency Bands: Band 12/17 (Lower 700MHz), Band 13 (Upper 700 MHz), Band 5 (850 MHz), Band 2/25 (1900 MHz) Band 4 (AWS 1700/2100 MHz). Smoothtalker cell phone signal booster increases voice, text and 3G/4G LTE signal strength for all North American carriers including AT&T, Verizon, Sprint & T-Mobile. Supports all networks except Sprint bands 26 (800MHz) and band 41 (2500 MHz) FCC Certified Made in North America: with 2 year warranty