Broan-NuTone ISB53L Indoor Remote Speaker, Eggshell WhiteEverything you need to set up a basic intercom system. The IMA-516 uses up to 10 remote stations plus 2 door speakers for intercom and door answering. As an added benefit, the unit can distribute music when connected to an external music sourceBroan-NuTone ISB53L Indoor Remote Speaker, Eggshell White Features:; This indoor speaker features a rotary volume control that can be turned off for privacy, a 'Push to Talk' intercom switch and an 'On-Off' door speaker switch; The 'Talk Lock' feature allows you to monitor any station; Recessed Indoor Remote Speaker w/Controls - Eggshell White