... etc.Digital Multimeter, performs AD/DC Voltage, AC/DC Current, Resistor, Conductivity, Capacitor and Diode test.DC12V power outputAudio inputAdjustable brightness, contrast, ... Audio inputPTZ controllerCommunicationRS232, RS422 simplex and RS485PTZ ProtocolCompatible with more than 20 protocols such as PELCO-D/P ... 5 inch TFT LCD Screen MultifucationCCTV Tester with and 12V DC camera power supply