You can dial the local calls, domestic and international calls with this terminal connecting with a desktop phone and a Sultable for Alarm System Compatible with GSM 850/900/1800/1900 MHz, widely used with many providersSimple to install and easy to maintain, A directional higher gain antenna can be connected to solve the poor coverage problemCompatible to PABX,alarm system,the recording system,etc.Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so onHow to use this device?Step 1: Install a : Insert the only when the terminal is switched off and the AC adapter is unpluggedStep 2: Connect the Antenna: For antenna connection, you can use your mobile phone to search for the place where the strongest signal is, then put the antenna there. Please do not make the antenna too close to the terminal. It will disturb the signal of the terminal.Step 3:Connecting your terminal with desktop phoneTo make calls, you should connect the telephone line with RJ11 phone port of GSM terminal and telephone setThere is one communication portal at the side of the terminal.You can connect one desktop phones with terminal. Step 4: Connect power adapter and switch on the power.Step 5: For a while, the device get GSM signal and enter normal working status.Step 6: Make phone call with your telephone set that connected with terminal.Specifications1.Networks support: GSM850/900/1800/1900MHz2.Frequency range:GSM 850MHz(Transmits: 824-849MHz, Receives: 869-894MHz)GSM 900MHz(Transmits: 890-915MHz, Receives: 935-960MHz)GSM 1800MHz (Transmits: 1710-1785MHz, Receives: 1805-1880MHz)3.Voltage DC 5V-12V4.Telephone line length: 150cmColour: whiteMaterial: plasticSize: 120 x 85 x 28mmPackage Contents:1 x Wireless terminal1 x antenna1 x EU plug1 x Telephone lineOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.