Key Facts 8channels GSM FWT SCG-8QE with 8SIM, 8Tel, 2 antenna, quad band 900/1800/850/1900MHz;SCG-8QE cabinet is made of 8 built-in independent main board. Users can reduce or add the quantity of board from 1 to 8 flexibly. Main features Provide accurate reverse polarity billing signal Display Caller ID Add prefix code automatically: The telephone setting can be set up to add the local area code when dialing local fixed calls and add IP prefix code when dialing long-distance calls. Locking wireless terminal, locking SIM card, locking service provider and locking districts (Optional) Parameter management: Parameters can be modified by hand via the connected telephone. Set up or cancel call diverting Support PBX Adjusting the volume of voice: microphone volume and speaker volume can be adjusted separately. Technical Specifications Environmental Temperature: -10¡æ to +40¡æ Relative Humidity: 10% to 95% Air Pressure: 86Kpa to 106Kpa Environmental Noise: ¡Ü60dB(A) Working Frequency: Automatically switch: GSM850Mhz /900 MHz/ 1800MHz/ 1900Mhz Frequency Stability: Better than 2.5 PPM Signal Sensitivity: -103dBM Transmit Power: £¼2W Power supply: AC 220V?5V.