The Mitel M680i is an expansion/keys module for Mitel 6800 series SIP desk phones. It features 16 programmable keys with LED indicators and a label strip for key identification. It is possible to connect up to three M680i modules to a single compatible phone. The module is powered through the connected phone and is compatible with Mitel 6865i, 6867i, and 6869i SIP phones (6800 series accessories).