The MITEL OpenScape Key Modul 410 (KM410) is an expansion module for the OpenScape Desk Phone CP410 and CP710. It provides 16 freely programmable keys with LED and a paper label holder for the key names. The phones support up to four KM410 modules to expand line appearances, favorites, and feature shortcuts. The module is a side-connection accessory that plugs into the accessory port of the CPx10 series and must not be connected/disconnected while the phone is powered on (it does not support hot-swapping). Compatible with OpenScape Desk Phone CP410 and CP710.