The Honeywell WAVE 2EX is an indoor sounder that can be mounted on a ceiling, or in a corner, or horizontally, or even vertically. The WAVE-2EX has a snap-open hinge case which provides easier installation and is the same size as a standard gang box. The Ademco WAVE-2EX is for use when auxiliary current is limited - has a selectable current/sound pressure option with current as low as 60mA while still producing 100db. 106db/110mA with high-output. This operates within the 6V - 14 VDC power range