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Hello! I've reviewed the user manual for the EDS Indoor Sounder series, which includes models IS 210, IS 211, IS 320, and IS 322. This document contains details about technical specifications, such as operating voltage, sound output, and indicates that IS 210 and IS 211 have tamper switches. Additionally, it provides connection information and dimensional specifications. I'm ready to answer your questions about these devices.
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Which models have a tamper switch?
What are the operating voltages for the sounders?
What material is the housing made of?