Battery-powered Microphone Amplifier CMBI Schoeps CMB-I Internal 6V Battery / External 7 - 13 VDC, Unbalanced Out, Includes K5 ISK Cable*unbalanced, medium-impedance output. *for use with short cables (a few meters). *for connection to any desired microphone input. If a recorder has no phantom powering or a microphone input is unbalanced as in many portable recorders and wireless microphone transmitters, a phantom-powered microphone can be awkward to use. For these and other situations SCHOEPS offers the CMBI, a battery-powered microphone amplifier with unbalanced output. Combine this with one of 19 microphone capsules of the Colette Series and you obtain a microphone which is acoustically equivalent to the balanced version using a CMC microphone amplifier. The CMBI features a readily available internal 6 V silver oxide battery which, combined with power-saving circuitry, gives up to 80 hours of operation. About 6 hours before the end of battery life a built-in LED begins to light up as a warning. In addition to battery operation, the CMBI allows for external powering through a standard XLR microphone cable. (The included K 5 ISK cable is not suitable for this mode of operation.) Because of this model's unbalanced, low-level output and its medium output impedance, the total cable length should be kept to less than about 15 m to avoid possible RF interference and impaired performance.Accessories:included:wooden case, battery, adapter cable K 5 ISK (miniature plug to 3.6 mm mini stereo phone plug, 5 m long)Available separately:microphone capsules, windscreens, etc.