1. 2.400-2.483GHZ, ISM band/GFSK modulation 2. Support 3Mbps RF audio data transmission 3. Support 48KHZ/16bit / single channel audio sampling 4. Audio delay is about 12.5ms 5. A wide range of applications: such as news interviews, film and television shooting, character interviews, program hosts, teaching training and other film and television recording, as well as connection to mobile phone recording 6. With real-time return monitoring interface, you can connect headphones to monitor the recording effect 7. Professional circuit structure, strong anti-noise interference ability 8. The product has a built-in microphone and an external microphone port. The external microphone has a small collar holder, which can be easily and quickly fixed on the chest clothes, allowing users to use more flexible and convenient 9. The recording sound quality is clear and the sound quality is good, bringing users the ultimate recording experience 10. Microphone directivity: capacitive omnidirectional 11. Working voltage: 3.3-5V 12. Working current: 100mA 13. Frequency range: 2.4-2.483GHz 14. Sending and receiving distance: about 50 meters 15. Charging current: 400maH 16. Charging time: about 2 hours 17. Working time: about 5 hours 18. Size: 50x50x21mm