Bogen's ASWG1 Amplified Ceiling Speaker is an 8" cone-type loudspeaker complete with a built-in 1-watt amplifier and volume control. The volume control allows adjustment of the paging level at each speaker location in the system. It is ideal for telephone-paging systems and interfaces with a standard 600-ohm telephone line. ASWG1 Amplified Ceiling Speaker is available on a white ceiling grille with a detachable knob for volume control.