The 6900 s are a premium phone family with a rich set of accessories and integrated telephony features The Mitel M695 Expansion Module adds 28 buttons to the existing Personal keys on a Mitel 6920, 6930 or 6940 IP phone. The M695 allows Mitel 6900 Series IP phones to become robust productivity enhancing desktop communication tools for users who need to monitor a large number of lines or Busy Lamp Fields.