Phone headset, Office headset, USB headset, 2.5 mm headset, Wireless headset.  Plantronics quick disconnet, Jabra Gn netcom QD
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Universal RJ9 Headsets

RJ 9 modural jack
RJ9 modular

The solution to a common problem of not being able to connect headset and telephone.
Even though most things have been standardized, the cord connecting the phone with the handset or headset is anything but standard as each telephone manufacturer had its own wiring cord. 
This cord will work with virtually any phone providing great convenience.
• 8-Position select switch — enables you to make your corded headset compatible with any telephone.
• Use any phone even if you changed phone. Eliminates the need for multiple cords for connecting to different phone systems.
• Control michrophone volumn. Allows you to increase the volume for optimum call clarity. A low-current mic amplifier on switch positions 6 through 8 boosts signal gain by approximately 12 dB.
• Smiliar to GN1200 Smart cord