Self Amplified Paging System IR Controlled Ceiling Speaker. The Viking model SA-1S is an 8 inch paging speaker that has a built in 1.5 watt power amplifier, an infrared remote control detector, and an integrated digital volume control, all built into an attractive off-white grill for flush mounting in office ceilings. The SA-1S self amplified paging speaker uses a proprietary two wire protocol in which both 40 volts DC power and audio are combined on the same pair of wires. It is designed for direct connection to the Viking Model SA-25 Self Amplified Paging Control unit, or use the Viking model SA-X12 expander/adapter to connect it to virtually any existing paging system. The SA-1S speaker includes an infrared receiver to accept volume control signals from a Viking Model SA-IR remote control. Aim the infrared transmitter at the speaker and press the buttons. The up/down buttons allow users to set the appropriate volume level for each room. The speaker provides an audible beep feedback tone to let the user gauge the volume level even when there s no background music (or page) playing at the time. Applications Speakers for Vikings SA-25 paging control unit Add to any existing paging system using the SA-X12 Small business offices Doctor s offices Conference rooms Features 8 inch paging speaker Built-in 1.5 watt power amplifier Infrared remote control detector Digital volume control Users set their own volume levels to suit the noise levels in the room. Allows users to totally mute the speaker Audible feedback beep to set the proper volume.