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Lightweight Infrared Wireless Hands-free 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.


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


300 μs


External microphone input (%%1293.5 monaural mini jack


Power Switch
Function button


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)


Control section: ABS resin
Filter section: Polycarbonate


54.2 (W) × 109 (H) × 27 (D) mm (2.13 × 4.29" × 1.06)


95 g (0.21 lb) (with battery and strap)


Neck strap …1

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Prices and specifications subject to change without notice.