Membrane switch circuit layer using FPC (flexible PCB). Circuit of high precision, qualifying spacing 1.0mm, the resistance value is very low, welded 25 Everlight's LED, stable and reliable performance and long service life. The products are mainly used in industrial control function keyboard, feel good, powerful. F150 frosted panel with Ketu Tai PET screen printing, Haven this product according to customer needs to design key content, color, effect, the appearance of fine, rich colors. In addition, this product has waterproof ring structure, using 3M9495LE tape, waterproof effect is prominent, suitable for use on the air humidity of the environment.