Two-way communication is accomplished through the use of speakers and micro-phones located on each side of the partition. The Master unit is equipped with a 15" gooseneck microphone, power on/off switch, power-on LED, and external volume controls. The Remote Unit is window-mounted and may incorporate a level 3 bullet-resistive insert.     Features: Heavy Duty Aluminum construction | Duplex Communication | Background Noise Level Monitoring | Dimensions of Master Unit: 2.8"x2.8"x8.8" | Short Curcuit Protection | Level Detection and Attenuation Control | <1% Distortion | Low Current Drain | Dynamic Noise Reduction Network | Reverse Voltage and Voltage Protection | Voice Activated Switch     SPECIFICATIONS: The SC-350 provides elctronic two-way, hands-free audio communications (duplex) between a partition. The SC-350 is equipped with a factory adjusted VOX switch to prevent ambient noise (below 85 decibels) from activating the unit. The SC-350 contains two voice channels, each incorporating a microphone amplifier, VOX switch, compressor, and a power amplifier. The sound amplifier does not exceed a 0.2% total harmonic distortion rating. The SC-350 is fully operational between 0°C and 50°C. Each order comes with an AC/DC power supply(120V AC stepped down to filtered 18V DC) and a 1-year warranty.     APPLICATIONS: Movie Theaters, Ticket Booths, Sport Arenas, etc.