Hotel Lock - PHL 100-G Brushed Stainless Steel W/ Golden, Mifare S50, 4 Pcs AA Alkaline Battery Battery Life About 10 Months in normal state Low Voltage warning if power less than 4.5 V Door Thickness between 36 - 70 mm 265 Access Record Staorage The key consist of Master Card, Building Card, Floor Card, Guest Card & Etc Time Clock Built In Mechanical Key for emergency Stand alone work model, no wiring work Dimensions : 242* 78* 18 mm