Receiver Parameters Operating Frequency: 640~690MHz Chip Operating Voltage: 2.8~3.6V Operating Distance: 0.1~50 meters Number of Channels: 100 groups with 200 frequencies for both A and B channels Channel Spacing: 0.3MHz Channel Stability: +0.005% (-10~50℃) Audio Signal-to-Noise Ratio: -96dB Frequency Response: 30~20KHz Dedicated Data Channel: 7kbps, with internal CRC checksum, audio and data transmitted using 32-bit encrypted words Transmitter Parameters Operating Frequency: 640~690MHz Chip Operating Voltage: 2.8~3.6V Number of Channels: 100 groups with 200 frequencies for both A and B channels Channel Spacing: 0.3MHz Channel Stability: +0.005% (-10~50℃) Microphone Gain Adjustment Range: 0~47.5dB, adjustable in 0.5dB steps Maximum Transmit Power: 10dBm Usage Time: 8 hours