The broadcasts quality signal wirelessly inside of the vehicle, so you can use your phone like normal while enjoying great signal and fast data speeds. Specifications•Compatibility: All Cellular Enabled Devices ( Smartphones/ Tablets)•Type: Voice/ Text/ 4G Data•Maximum Gain (dB):50 Decibel•Frequency Range: 700 MHz At Band 12/17/ 700 MHz At Band 13/ 850 MHz At Band 5/ 1700/2100 MHz At Band 4•Length (IN):6 Inch•Width (IN):4-1/2 Inch•Height (IN):1-1/2 Inch•With Antenna: Yes | Vehicle Cell Signal Booster Kit