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Getting Started

Headset Jack

You can use this telephone hands-free when you install a 2.5 mm headset (purchased separately). To install, plug the headset into the HEADSET JACK at the top of the handset.

While in headset mode, the volume of headset is controlled by the telephone and the handset’s earpiece and microphone are disconnected.

Ordering a Headset: In the event you wish to purchase a headset for your C440, please contact Plantronics at

1-800-544-4660 for location near you. We recommend using the Plantronics M110 or M130 headset.

Belt Clip

You may choose to use the optional belt clip with your handset.

1.To attach slide belt clip down onto groves. Press the tabs on the belt clip into the slots to attach.

2.To remove, lift one side of the belt clip with your thumbnail and push back.

Hearing Aid Compatibility

The handset has a special coil inside of it to couple the sound to hearing aids equipped with T-Switches/T-Coils.

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Clarity 440 manual Headset Jack