UHF-9 Headset LED Wireless Noise Cancelling Earphone (Black)

1. Plug diameter: 3.5mm 2. Wire length: 3 m 3. Horn diameter: 40 mm 4. Sensitivity: 10dB 5. Frequency response range: 20-20000Hz 6. Distortion rate: less than 1% 7. Impedance: 32 8. Signal to noise ratio75dB 9. Frequency Response: 30 – 20,000Hz 10. Headphone power supply: built-in 600MaH rechargeable lithium battery 11. The headset must be connected to the transmitter for use 12. Application of active noise reduction technology. The signal-to-noise ratio is above 70DB and the separation is 50DB, almost no noise is felt, which is close to the level of wired headphones. 13. By playing up to 3 different audios. 14. No audio source automatic shutdown design. When there is no sound source, the headset will automatically turn off after 5 minutes, avoiding stray interference.