ATEX certified for use in Zones 0, 1, and 2Intrinsically safe when used with zener barriers100 dB (A) nominal sound output levelInternal volume controlChoice of 49 alarm tonesExternal control of 3 tone stages - (different stage corresponds to different alarm circumstances)IP 65 self-extinguishing ABS housing3. 5 inch (88. 7 mm) dia. x 4. 6 inch (116 mm) hOperating voltage (nominal): 24 VDCLED colors: red, yellow/amber, blue, green