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Now you can use an unlimited number of systems in
the same building and not worry about frequency interference! The
Azden "Red" Series of infrared wireless microphones is the solution
for classrooms, auditoriums, churches, conference/meeting rooms,
and health clubs, and where ever security is an issue. 
 
The two-channel IRR-30 receiver allows the use of two mics at the
same time. Each channel has its own frequency and every IRR-30 uses
the same two frequencies. The receiver's built-in sensor array
allows complete freedom of movement in a 1600-sq.ft. room. For
larger rooms, up to three wall/ceiling mountable external sensors
(IRD-30 or IRD-60) increase the working distance. If the receiver
is mounted in a secured cabinet the third sensor input disables and
replaces the receiver's internal sensor. 
  
 Technical
Specs: 
Sub-carrier frequencies: 2.06MHz & 2.56MHz 
Type: super heterodyne – crystal controlled 
Modulation: FM 
Signal-to-Noise: >90dB 
Reception sensitivity: >25dBµV 
Audio output adjustment 
mic: –20dB max 
line: 0dB max 
Audio output impedance 
mic: <1.5k ohms 
line: <1k ohms 
Power requirement: 12VDC @ 200mA 
Size: 8.46" W x 8.27" D x 1.73" H (215 x 210 x 44mm) 
Weight: 2.53lb (1.15kg) 
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