SelecTone Explosion-Proof Amplified Speaker, 120/240VAC - Available in 24VAC/DC and 120/240VAC. Digital signal amplification. Fused input and output. Built-in gain control, adjustable between 0 dBa to 114 dBa at 10 feet (0 dBa to 124 dBa at 1 meter). Type 4X, IP65 enclosure. CSFM Approved. UL and cUL Listed for Class I, Division 1, Groups B, C, and D & Class I, Division 2, Groups A, B, C, and D & Class II, Division 2, Groups F and G & Class III.