Product SKU : AlbaUrmet-EL2020IN Electronic Door Lock for In-swing / Out-swing doors. Designed for flush mount Wooden, Alumimium & Steel Doors. Stainless Steel Finish, with Brass Cylinders Double cylinder for night latch feature with 3 keys. Operation time : Requires power to open, 0.5 sec at 12 vac to 18 vac.