Telrad 79-110-0000/1 Digital Key BX Key Service Unit (Refurbished)The Telrad DIGITAL family includes two end to end digital telephone systems DIGITAL KEY BX and DIGITAL 400 each of which brings your office into the era of full integration and simultaneous transmission of voice and data. Combining advanced technology with simplicity of operation, the DIGITAL systems are capable of meeting all your data and communication requirements for years to come. The DIGITAL systems provide an optional ISDN Primary Rate