Piezo switch Dimensions ? x H: 28 x 19.5 mm Temperature range: -40 ... +55 °C Colour: Stainless Steel Contacts: 1 Make Contact (NO) Housing Material: Stainless Steel Illumination: No Protection rating: IP66 Switching type: Impulse Function, Piezo Principle Termination type: Stranded Wires, 300 mm Flush-mounted ?: 22 mm Rated voltage: 24 VAC/DC