Features 1. High-quality transmit with 48k-16bit sampling. 2. Uncompressed transmit. 3. About 100 meters transmit of outdoors. 4. It is easy to use,plug and play. 5. AU680 wireless audio transmitter is a transmitter that enables wireless audio for home entertainment. 6. The product consists of the transmitter and the receiver. Specification 1. Operating Voltage: Transmitter: DC 3.6V-5.5V; Receiver: DC 3.6V-5.5V 2. Working current: Transmitter: 250mAh; Receiver: 100mAh 3. Ambient temperature: 0-85 degree C (Transmitter and Receiver) 4. The actual operating frequency range of the modual: 749-770MHz (Transmitter and receiver) 5. Modulation: Pi4DQPSK (Transmitter) 6. Channel spacing: 4MHz (Transmitter and receiver) 7. Frequency selection method: Transmitter: Carrying channel one-way loop selection; Receiver: Provides automatic search and manual conversion of two models 8. Frequency stability: +-100KHz (Transmitter and receiver) 9. The actual working channel of the modual: 20CH 10. Module channel spacing: 1MHz 11. Transceiver distance (using transmit power 100nv in open space): 100m 12. Transmit power (default is 100nV when ordering): 1-100mV (default 100mV) 13. Receiving sensitivity: -95dBm(Receiver) 14. Input level: 1.0VpK(Transmitter) 15. Input resistance: 10K ohm (Transmitter) 16. Input interface (Transmitter): - Three input modes -Stereo audio input -Normal microphone input -Monitor pickup audio input 17. Stereo input level 1: 30mW RL=32ohms (Receiver) 18. Stereo input level 2: 50mW RL=32ohms (Receiver) 19. Output impedance: 1k ohms (Receiver) 20. Input-output gain ratio: 1:01 21. Sphere of influence: 20-20000Hz 22. Time latency: 2.5ms 23. Sampling Rate: 48KHz 32bit 24. Signal to noise ratio: 96dB 25. Distortion: 0.3% at 1KHz 26. Dynamic Range:90dB 27. Left and right channel isolati