This Navien 4-inch Wall pad is a compact-sized home network wall-pad with a matt and punched cover case which emphasizes its luxurious and exclusive style. Each operating mode is distinguished by an LED backlight display emitting from between punched holes which is designed to give an emotional user interface, which also reduces operating modes to just three options – emergency, call, door open – in order to provide a user-friendly interface. The size of the wall-pad is relatively compact, 200 x 140 x 30 (W x L x D), and the “Option” button is installed on the right for comfortable use.