... GSM 850MHz, GSM 900MHz, GSM 1800MHz (7 kinds) GSM 1900MHz, GSM 850/1900MHz, GSM 900/1800MHz, GSM 900/1900MHz Frequency stability: < 2.5 ... ppm Receive sensitivity: < -100 dBm Transmit power: < 2W (850/900 MHz), < ... 1W (1800/1900 MHz) SIM card mode: 3.3 V Antenna impedance: 50 Ohm Antenna Gain: 2.5dBi (omni directional ...