Jiangxi Best Science & Technology Co., Ltd. [China]

1 light 2 workmanship is good 3 high quality

Receiver:

Frequency Response Range: 300Hz-3400Hz

Alternating current  impedance: 300 Ω or 600Ω  ( 1kHz)

Sensitivity: ≥118db (1kHz)

Use as one part of headset.

noise cancelling headset speaker