... 1 channel OutputVideo Output Mode1.0 Vp-pPTZ controllerCommunicationRS232, RS422 simplex and RS485PTZ ProtocolCompatible with more than 20 ... screen. Read the number of the test box.DC12V 1A power outputDC12V power output Output DC12V1A power for cameraAudio input testAudio input ... .6mA, 66mA, 660mA, 10A Manual rangingResistor660, 6.6K, 66K, 660K, 6.6M, 66MΩ auto/manual rangeContinuityBuilt-in buzzer ...