These digital 6400 Definity Phones are for today's fast paced businesses. 6400 Series phones help increase productivity, with hard working features that enhance the ability to communicate. These telephones are designed in response to customer feedback, and are made to give you maximum ease of use. Programmable and expandable, these phones have all the features your office needs in a business phone. They also allow for one-touch operation with headsets so you can answer, hang up, and dial without having to pick up the handset. Additional features are a pull out instruction card and Hearing Aid Compatibility.