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The Yealink EXP40 is an expansion module for the SIP-T46S, SIP-T46G, SIP-T48S and SIP-T48G phones. The EXP40 expands the capabilities of your phone thanks to a large grayscale LCD that offers two pages of 20 programmable keys. The EXP40 can be customized to deliver up to 40 different productivity-enhancing features, including BLF/BLA, speed dial, call forward, transfer and more.
You can string up to six of the EXP40 consoles in one daisy-chain, giving you 240 extra keys. Two consoles can be powered through the primary phone that they're hooked to.