spontaneous unaffectedHot Door Switch Stainless Steel Door Release Exit Push Button Access Control Silver stainless steel shell, safe and durable. Looks simple, comfortable and beautiful. Undergoing 50,000 times continuous clicking test, very durable. Good to touch, easy to operate and use. Activates electric strike, magnetic lock or other elctric lock via access control keypad. Works with most electronics access control keypads, door phones with access control keypads. Flush mounting. Current: 3A, 36V DC. Applied temperature: -10+55(14-131F). Applied humidity: 095% (relative humidity). Material: Stainless steel. Size:9.1cm x 2.9cm - 3.58inch x 1.14inch.