Streamline Modular Electronic Sounder, Grey - Compatible with 12-24VAC/DC or 120-240VAC (a). PLC compatible with PNP or NPN connections (a). Produces two tones. Choice of 64 selectable tones. Adjustable volume between 55 to 95 dBa at 10 feet (65 to 105 dBa at 1 meter). Seven mounting base options. Type 3R, IP65 enclosure. CE Certified and RoHS Compliant. UL and cUL Listed. (a) Note: Voltage and PLC connections are dependent on selected base.