Image is Representational - See Manufacturer Specs | Transducer - Piezo - Alarm - Continuous - 30 V to 120 V - 18 mA - 85 dBA - 4000Hz to 5000Hz - Screw Panel Mount. The SC110MH is a Piezo Transducer made of 6/6 nylon housing. It features medium sound level category and continuous mode of operation. The knurled nut is used to attach part to panel and maximum recommended torque is 10 in-lbs.