The IR-300M is a hands-free infrared wireless microphone. It eliminates problems with interference or eavesdropping, allowing simultaneous use in adjacent conference rooms or school classrooms. Since infrared wireless microphone system uses a frequency band that does not interfere with that of the TS-800 and TS-900 series infrared conference system, both systems can be simultaneously installed in the same location.
| Battery | IR-200BT-2 rechargeable battery for the infrared wireless microphone (option) or AA alkaline dry cell battery (2 pieces). |
|---|---|
| Current Consumption | Typ. 250 mA (2.4 V, Power selector switch: N) Typ. 340 mA (2.4 V, Power selector switch: H) |
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. 20 m (65 ft) (Power selector switch: H, in an unobstructed space) Approx. 15 m (50 ft) (Power selector switch: N, in an unobstructed space) |
| Tone Signal | 32.768 kHz |
|---|---|
| Modulation Sensitivity | ±4.8 kHz (1 kHz, when SPL of 84 dB is input) |
| Maximum Input Sound Pressure | 120 dB SPL |
| Input Sensitivity Adjustment | Adjustment range: -9 dB to 0 dB (factory preset: 0 dB) |
| Microphone Unit | Unidirectional electret condenser microphone |
| Frequency Response | 100 Hz – 12 kHz |
| Preemphasis | 300 μs |
| Input | External microphone input (φ3.5 monaural mini jack) |
| Battery Operation Time | Approx. 8 h (when the IR-200BT rechargeable battery for the infrared wireless microphone is used, Power selector switch: N) Approx. 6 h (when the alkaline battery is used, Power selector switch: N) |
| Operating Temperature | 0 ℃ to +40 ℃ (32 ゜F to 104 ゜F) |
| Operating Humidity | 30 % to 85 %RH |
| Finish | Control section: ABS resin, metallic gray, paint, 50% gloss Filter section: Polycarbonate, optical cut filter |
| Dimensions | 64 (W) × 91.3 (H) ×27.3 (D) mm (2.52″ × 3.59″ × 1.07″) |
| Weight | 130 g (0.29 lb) (with battery and strap) |
| Accessory | Screw driver (for setting) …1, Color label (6 colors) …1 |