Sony ECM-77B (ECM77B) Lavalier Microphone Perfect for television applications. Condenser Microphone is a miniature Lavalier microphone designed to be inconspicuous. This tiny mic runs on either phantom power or AA battery operation. Have used couple of times, it is in excelent condition and perfect working order. 40 Hz to 20 kHz. 52.0 dB ±2 dB. 90 dB or more. 64 dB or more. 30 dB SPL or less. Induction Noise From External Magnetic Field [5]. 5 dB SPL or less. 40 dB SPL or less (with windscreen). Maximum Input Sound Pressure Level [7]. Supplied with XLR-3-12C (male) connector in power supply unit (single AA size battery). DC 1.5 V (AA size battery) or +48 V phantom power. Internal battery: 0.3 mA or less. External battery: 2 mA or less. 5.6 X 12.5 mm (Mic head). 20 X 133 mm (Power unit XLR type). 13/16 X 5 1/4 inches (Power unit XLR type). 1/4 X 1/2 inches (Mic head). 4.3 oz (with power supply unit). 121.5 g (with power supply unit).