Details Full-duplex two-way communication Wide frequency response and high volume All metal beltpack with clip Noise-cancelling mic Mic switch and volume control Connects to intercom with standard mic cable Item Code SMQ-1 Technical Specifications SMQ-1 Single-ear Intercom Amplifier Type Solid state, IC amplifiers, current-limited with reverse-polarity and short-circuit protection Signal-to-Noise Ratio 65dB Distortion <0.5% THD @ 1kHz MIC Pre-amp Frequency Response 200Hz - 10kHz, contoured for enhanced vocal intelligibility Microphone Type Dynamic, noise-rejecting Headphone Frequency Response 200Hz - 12kHz Sound Pressure Level 110dB SPL max Power Requirements Talk: 10 mA average Voltage Range: 12-32V DC Environmental 32 - 122° F (0 - 50° C) Dimensions Beltpack Dimensions: 1 x 3.5 x 1.5in (HxWxD) (25 x 89 x 38mm) Weight Headset: 8.5oz (0.24kg)