1,Two open solution: single card solution and dual card solution. 2,Sound and light indication when it works... Applications: widely applicable to the swimming baths, sauna field, golf courses, the more gym Wardrobe, institutions, Gym ,enterprises, schools, hotels, supermarkets, such as filing cabinets or lockers. Dimension out: 120x42x20mm (LxWxH) inside: 130x68x22mm (LxWxH) Power supply DC4.2v- ...