Vanma® Cylinder is a digital-key-based solution. Administration for both the digitalkey-based solution and the mobile-phone-based solution is handled by one, flexible, modifiable, easy-to-use platform. Unique design minimizes the expenditure associated with system wiring and drives down lifecycle costs. Access rights to lost, stolen or unreturned keys can be quickly and easily blocked maximizing security while minimizing administrative work and costs. The product should not be modified in any way except in accordance with those modifications described in the instructions.