Allworx 8110032 TX 92/24 Expansion Unit for 9224 (Refurbished)Key Features: Mnfr. Part #: 8110032 Allworx Tx 92 24 expander For use with the ALL 9224 phone The ideal solution for anyone who needs an array of one touch features or the ability to monitor or route a high volume of calls directly from their phone Up to 3 Tx expander units can be anchored to any ALL 9224 phone for an additional 24, 48, or 72 programmable function keys offering you access to a total of 96 with just one phone Each programmable function