Smoothtalker Stealth Z660 home/building booster covers all cellular devices and all cellular network providers. It will boost data, voice and provide signal where you need it. The external antenna kit includes hardware for mounting the antenna to the inside of a window for places where outside installation is not possible. Versatile, reliable and long lasting cellular signal boosting solution. 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).