| Product Name | Digital Wireless Discussing Conference Microphone |
| Model NO. | RC-4216C/D, RC-4217C/D |
| Power supply | DC4.5V (3 AA batteries, long continuous working time) |
| Working currnet | Standby ≤ 110mA, speaking ≤ 180mA |
| Voice communication | UHF wireless mode (one-way) |
| Frequency range | 640MHz – 690MHz |
| Maximum modulation | 60K |
| Radiated power | ≤+9dBm |
| Frequency deviation | <0.002 |
| Reference speaking distance | 10cm-50cm |
| Operation temperature | -10℃-40℃ |
| Product Name | Digital Wireless Discussing Conference System Main Controller |
| Model NO. | RC-4220M |
| Carrier band | UHF640MHz – 690MHz |
| Modulation mde | FM |
| Working effective distance | 60-100 Meters |
| Shock mode | PLL phase locking frequency synthesis |
| Sensitivity | S/N > 60dB at offset equal to 25kHz and input 6dBv |
| Frequency band width | 50MHz |
| Maximum deviation | 45 KHz of earth |
| S/N | >105dB |
| Frequency Response | 45Hz-18KHz 1dB |
| Power input | DC12V-15V, 2-3A |
| Power consumption | <10W |
| Operation temperature | -10℃-40℃ |
