Piezo switch Dimensions ? x H: 18 x 20 mm Temperature range: -40...+55 °C Colour: Stainless Steel Contacts: 1 Make Contact (NO) Housing Material: Stainless Steel Illumination: Yes Light colour: Ring / Blue Protection rating: IP66 Switching type: Impulse Function, Piezo Principle Termination type: Stranded Wires, 300 mm Flush-mounted ?: 16 mm Illumination Supply Voltage: 5 VDC Rated voltage: 24 VAC/DC