Holion is the market leader for the design, development, manufacture and the marketing of Intelligent Guestroom Energy Saving & Control System. Since 1997, we have been leading the industry by having a professional and experienced R&D department. We are the only company that has 3 kinds of bus modes: RS485, CANBUS, TCP/IP in our Intelligent Guestroom Energy Saving & Control System in China??olion is a high tech manufacturer with ISO 9001 certified. We have our own producing place of 1000 square meter. We are the member of Hotel & Restaurant Supplier Committee, Energy Saving Committee, and China Tourist Hotels Association. All products are being proved by national authentication department.