Valcom Slimline Wall Speaker, V-1042, is self-amplified and may be used to provide one-way paging from any Valcom one-way or talkback page control. This speaker has an externally accessible volume control located behind the grille and is screwdriver adjustable. The V-1042 will cover an area up to 600 square feet and should be spaced 20 feet apart. Good quality paging will be heard up to 30 feet in front of the speaker.