Technical SpecificationDimensions: 40mm HX181mm WX104mm D(1.6X7.125X4.1 in.)Weight: 327 g (11.5 oz.)Housing: ABSAudio Output Level(Ref. +/- 33 kHz deviation with 1kHz tone): XLR connector (into 600Ω load): -19 dBV1/4 inch connector (into 3000Ω load): -5 dBVOutput Impedance: XLR connector: 200Ω1/4 inch connector: 1kΩXLR output: Impedance balancedPin 1: Ground (cable shield)Pin 2: AudioPin 3: No AudioSensitivity: -105 dBm for 12 dB SINAD, typicalImage Rejectio: >70 dB, typicalPower Requirements: 12-18 Vdc at 150 mA, supplied by external power supply Audio Input Level: +2dBV maximum at -10dB position- 8dB maxmum at 0 dB positionGain Adjustment Range: 10dBRF Transmitter Output: 30 mW maximum (dependent on applicable country regulations)Dimensions(including SM58 cartridge): 254X51mm dia.(10X2 in.)Weight: 290 grams (10.2 oz.) without batteriesHousing: Moded PC/ABS handle and battery cupPower Requirements: 2 "AA" size alkaline or rechargeable batteriesBattery Life: >8 hours(alkaline)