Fangrui Product Details 1.input Dc12v 2.contact Rating 3a 36vdc Max 3.output Contact No/com 4.mechanical Life 500000 Tests Door Exit Release Button Zinc Alloy Panel Suitable For Door All Kinds Doors Operating Temp -20~+55 Degree(14-131f) Suitable Humidity 0- (relative Humidity) Step 1: Use A Screwdriver To Remove The External Screws Of The Switch. : After Determining The Installation Position Of The Switch, Fix The Bottom Mounting Plate With Screws. Step 3: Plug In The Connected Cable, Close The Switch Parts, And Tighten The Screws To Complete The Installation. Step 4: Installation Is Complete. Colour:silver Material:zinc Alloy Package Contents: 1 X Exit Button Switch Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.