Features 1.3 channels; 2.Screen: 7 inch color graphic LCD touch screen; 3.Built-in lithium battery: 1850mAh. Main machine: 1 PC Patient cable: 1 PC Limb electrode: 1set (4pcs) Chest electrode: 1set( 6pcs) Power cable: 1 PC 80mm*20M recording paper: 1 PC Paper axis: 1 PC Power cord: 1 PC