Functions: 1.Combine the signal receiver with the telephone together 2.The full mobile operation mode and function, easy to operate 3.Four LCD rows to display the different operation and the call duration 4.8 ringings for your choice 5.The phone and the card divided, easy to manage 6.The phone and the card can lock with each other 7.Can set the long-distance telephone call to dial IP automatically 8.Support free-hands talk 9.In-built Li-on battery 10.In-built antenna 11.With reliable and simple to operate of network system 12.Not need adjustment, easy to install and easy to maintain