Special design to fit with different panels such as Mosaic panel, convenient to users to install to different devices. The precision construction design enables the key operated in a long mechanical life under the normal environment. Available Size: Rectangular 18 x 24mm Square 18 x 18mm & 24 x 24mm Round Ø 18mm With both momentary & alternate functions to meet various practical demands. Precise design in key construction to ensure the movements of insertion & withdrawal can be performed exactly. IP40 protection degree. Removable operation & contact parts for easy installation. Easy disassembly and additional contacts are available. Special terminal design with options of soldering or plug-in terminal. Applied UL94V-0 high grade fire prevention plastic material. VDE/CE/UL/CUL (pending).