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The Model 2221 provides the highly stable DC polarization voltage required by precision microphones along with low noise amplification enabling it to drive input and output cables as long as 500 feet. It is rugged, light-weight and will provide up to
forty hours of continuous operation(with PRM902 Microphone Preamplifier) using six AA internal batteries. It can also provide sufficient current to power the PRM903 Microphone Preamplifier, which has an internal heater.