Leviton 28A00-1 Surface Speaker/Microphone Module Allows two-way communication with a central station after an alarm and paging and listening from an on-premises or remote phone Annunciation of alarm and zone by voice, and voice messaging (not available on all systems) when connected to a Two-Way Voice Module Works with Lumina, Lumina Pro, Omni LTe, Omni IIe, or OmniPro II home control systems Requires Two-Way Voice Module (Leviton Part Number 10A11-1) Leviton recommends professional installation on Security and Automation products. To find an installer in your area, please email dealer@leviton.com