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Hands Free Office Telephone Headset With RJ9 Telephone Plug & Coiled Cord.
The RJ11 plug only has to be placed in the telephone and the headset is ready for use. The headset is equipped with a sensitive and clear microphone with noise reduction and is very comfortable to wear.
Driver Unit: 30mm
Speaker Impedance: 32ohm ± 15%
Speaker Sensitivity: 97dB ±3dB
Speaker Frequency Response: 20-20.000 Hz
Maximum Power Input: 40mw
Microphone Operating Voltage: 4.5V
Microphone impedance: 2.2 K
Microphone sensitivity: -58dB ± 2dB
Microphone Frequency Response: 30-16.000Hz
Coiled Cord Length when extended: 1.8 meters
Plug: RJ11 type plug wired with 4 pins (Known as RJ9, which is headset specification) 
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