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 Contact output: NC\COM Applied temperature: -10 ~ + 55 Celsius(14-131F) Applied humidity: 0~95% (relative humidity) Material: Stainless steel Color:Silver Item size: 9 x 2.5cm (L x D) Weight: 240g Package including: 2 x Door Switch Button 4 x Screws Only the above package content, other products are not included. Note: Light shooting 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.