Phonetone Cell Phone Mobile Booster with Indoor Antenna and Outdoor Antenna (1900MHz) Frequency Range:1850-1910MHz,1930-1990MHz Max output power : 27dBm; I/O Port : N-Female on both ends; Power Supply: AC 100-240V / DC 12V 2.0A Boost GSM W-CDMA 1900mhz cell signal to make call and send txt. Coverage up to 3000sqft,supports 50 simultaneous users,No more dropped calls. Before purchase, please check your cell phone signal frequency. Because each carrier operator has different frequency. If you are not sure, please tell us your signal carrier and signal type(2g 3g or 4g), we will help you. Or you can to check: https://www.frequencycheck.com/carriers