1. 2.400-2.483GHZ, ISM band/GFSK modulation2. Support 3Mbps RF audio data transmission3. Support 48KHZ/16bit / single channel audio sampling4. Audio delay is about 12.5ms5. 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 recording6. With real-time return monitoring interface, you can connect headphones to monitor the recording effect7. Professional circuit structure, strong anti-noise interference ability8. 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 convenient9. The recording sound quality is clear and the sound quality is good, bringing users the ultimate recording experience10. Microphone directivity: capacitive omnidirectional11. Working voltage: 3.3-5V12. Working current: 100mA13. Frequency range: 2.4-2.483GHz14. Sending and receiving distance: about 50 meters15. Charging current: 400maH16. Charging time: about 2 hours17. Working time: about 5 hours18. Size: 50x50x21mmSpecification: Package Weight One Package Weight 0.31kgs / 0.67lb One Package Size 14cm * 13cm * 5cm / 5.51inch * 5.12inch * 1.97inch Qty per Carton 72 Carton Weight 19.86kgs / 43.78lb Carton Size 49cm * 48cm * 33cm / 19.29inch * 18.9inch * 12.99inch Loading Container 20GP: 343 cartons * 72 pcs = 24696 pcs 40HQ: 797 cartons * 72 pcs = 57384 pcs