Teledex Diamond Series: Single and Two-Line Telephone. Integrated Speakerphone* Hands-free conversations*. Guest Service Buttons, Up to ten (10) for one-touch access to hotel Services. ADA Handset Volume Boost, Three (3) distinct levels, compliant with HAC/VC and FCC requirements. Raised Red Message-Waiting Lens, Easily seen from any area in the guestroom. Message-Waiting Circuitry, Message Waiting will activate on high or low voltage; Guarantees operation of up to 7 phones for suite applications, with an extra-bright message-waiting lamp. Mute Key Deactivates microphone during speakerphone and handset calls; a red LED indicates activation**. Speaker On/Off Key With red LED for easy speakerphone activation*. Electronic 3-way Call Conference Function with LED indicator for convenient multi-line conversations***. Hold Key Places the active line on hold so the second line can be used or a conference call initiated***. Hold Release Detection Circuit Releases calls on hold when line is