... ,AV2,AV3,AV4, and then connect the 12V DC power adapter--Switch on the power button, LED1,LED2,LED3,LED4 are on ... AV5, and connect the antennas, and then apply the power--Switch on the power button--Set RX1,RX2,RX3,RX4 to ... on when the strongest signal is confirmed. It will automatically switch to the receiver with the strongest signal