FeaturesAdds 24 additional programmable call appearance/feature buttons to the 6416D , 6416D M, 6424D , or 6424D M digital telephoneRequirementsThe XM24 Expansion Module requires an 1151A1 or 1151B1 auxiliary power supply to function.Includes RefurbishedLibrary Avaya XM24 24 Button Expansion Module Installation Instructions.pdf
