Available in 24VAC/DC, 120VAC and 240VAC Reliable, solid-state circuitry Digital signal amplification Fused input and output Built-in gain control, adjustable between 0dBA to 110dBA @ 10' (0dBA to 120dBA @ 1m) Type 4X enclosure External mounting tabs Indoor/outdoor use UL 1480 and CSFM Approved UL and cUL Listed