4.3 STATION EQUIPMENTKeyset with 24 buttons (NX-24E, NX-24B)Built-in speakerphone24 programmable soft keys (12 with tri-colored LEDs) and 10 fixed-function keysUP/DOWN buttons for digital control of speaker, handset, and ringer volumes.Four selectable ring tones per keysetDesk- or wall- mountNX-24E keyset with 16 character displayKeyset with 12 buttons (NX-12E, NX-12B)Built-in speakerphone12 programmable soft keys (6 with tri-colored LEDs) and 10 fixed-function keysUP/DOWN buttons for digital control of speaker, handset, and ringer volumes.Four selectable ring tones per keysetDesk- or wall- mountNX-12E keyset with 16 character displayBasic keyset with 6 buttons (NX-6B)6 programmable soft keys and 10 fixed-function keysUP/DOWN buttons for digital control of speaker, handset, and ringer volumes.Four selectable ring tones per keysetDesk- or wall- mountAdd On Module (NX-AOM)24 programmable soft keysNX-SERIES HYBRID KEY SYSTEM GENERAL DESCRIPTION SECTIONNX-24E NX-24B NX-12ENX-12B NX-6B NX-AOM1 - 7