Great memory capacity,the ibutton can memorize data max to 64k;High security,64 global exclusive serial yards are unable to model;Long uselife,the high-performance lithium battery inside and low consumption ibutton guarantee the data can be stored more than 10 years;Defending static,causticity,attrition,and waterproof etc;Can register 255 exclusive user cards and support offline network function; Widely used in hotel, guesthouse,office and household,etc;