As a core component of Building Management Systems (BMS), BH-1 manages large information sets in a building and facilitates data transfer to client PCs for effective BMS operation. A user interface consisting of a display and buttons are designed to ensure users can easily recognize settings / error information even in low light environments. A noiseless design that conceals the mechanism for exchange parts and wiring enables users to concentrate on the status on the display. Simultaneously, this design visualizes high capability of the system as a symbol of Azbil, Japan's No. 1 BMS provider of high technological performance on saving energy.