1.Unlock by emergency key and card2.Support advanced hotel system,easy to manage.3.Made of 304 stainless ,100% waterproof and never fade in 10 years.4.Low power consumption ,4 batteries can last 1 year .5. Made Of 304 Stainless Never fade in 10 years ,anti-rust and waterproof 1.How to determine whether the lock fits your door or not?(1)Measure door thickness;(2)Measure the length of guide plate;(3)Measure the width of the guide plate.If your door thickness is 38-50mm,then your door fits our lock!If you are not sure whether it can be replace your old lock or not,please contact and tell us the details of it directly!