Commo connections through the radio on the box are by way of a single RJ45 breakout board and 1 RJ12 connector, each mounted at the rear with the box. Commo with the box for the microphone is through 1 RJ12 connector, which is applying only three in the 6 wires: mic floor, very hot, and 5v.The U8G can be an upgraded Edition of final year's Hisense