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The AKG ASU 4000 power supply unit is an in-line device featuring 2 BNC connectors and 12V DC power supply connection (power supply not included). The ASU 4000 is designed to remotely power AKG 4000 series antennas and in-line accessories such as the AB 4000, SRA 1 and RA 4000B. Up to 6 antenna components can be powered with a single ASU 4000. The power supply is waterproof and features a rugged metal housing, suitable for outdoor use.