Image is Representational - See Manufacturer Specs | Transducer - Medium Pulse - 16 V to 28 V - 40 mA - 95dBA/105dBA - 2900Hz - Panel Mount - Terminal Block. The SCE028XD3MP1B is a Piezo Transducer made of 6/6 nylon housing. It features loud sound level category and continuous tone mode of operation. The knurled nut is used to attach part to panel and maximum recommended torque is 10 in-lbs.