CT-1055/CT-1050 (170-1007/1021) Optional Accessories Faxback Doc. # 8863 Cellular Telephone DATA INTERFACE (Cat. No. 17-720) - The data interface lets you send and receive faxes with a cellular phone. You can also connect the data interface to any other data device, such as a computer modem, that is physically compatible with the adapter. HANDSET EXTENSION CABLE (Cat. No. 17-722) - Extends the handset cable so you can use the handset within a larger space. EXTERNAL SPEAKER - Provides extra convenience and excellent voice reproduction. You can install the speaker anywhere. Its volume level is controlled along with handset volume. (smc-01/18/94)