Intelligible Classroom System
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IR-310M Teacher Microphone


The IR-310M is a lightweight, hands-free infrared wireless microphone. It is designed for use in the school classrooms and eliminates problems with interface or eavesdropping, allowing simultaneous use in adjacent classrooms. It is capable of operating on one of two selectable IR frequencies and two transmitters can work simultaneously. It is also capable of operation with one piece of rechargeable AA Ni-MH battery IR-200BT-2 for continuous operation up to 8 hours.


Battery One piece of IR-200BT-2 rechargeable battery for the infrared wireless microphone (option)
Current Consumption typ. 215 mA (1.2 V)

Infrared Emitter

Wavelength 870 nm (AM: Brightness modulation)
Modulation Method Frequency modulation
Carrier Frequency Channel A: 3.100 MHz
Channel B: 3.350 MHz
Transmission Distance Approx. 15 m (50 ft) (in an unobstructed space)
Tone Signal 32.768 kHz
Modulation Sensitivity ±4.8 kHz (1 kHz
Microphone Element Electret condenser microphone
Maximum Input Sound Pressure 120 dB SPL
Input Sensitivity Adjustment Adjustment range: 2 levels (High
Frequency Response 100 Hz - 12 kHz
Preemphasis 300 μs
Input External microphone input (%%1293.5 monaural mini jack
Switch Power Switch
Function button
Indicator Power LED (Combined with battery life indicator)
Battery Operation Time Approx. 8 hours (when used with one piece of IR-200BT-2 rechargeable battery)
Operating Temperature 0 ℃ to +40 ℃ (32 ゜F to 104 ゜F)
Operating Humidity 90 %RH or less (no condensation)
Finish Control section: ABS resin
Filter section: Polycarbonate
Dimensions 54.2 (W) × 109 (H) × 27 (D) mm (2.13 × 4.29" × 1.06)
Weight 95 g (0.21 lb) (with battery and strap)
Accessory Neck strap …1