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http://www.kom-key.com/products/custom-waterproof-membrane-switch-with-lgf-constru.html

Product characteristics of lgf construction
LGF is a thinner construction, without limited to devices thickness.

LGF has a limited impact on the tactile feel of buttons.

LGF can provide even backlight across larger and small areas.

Reliability and long lifetime, Low-Cost

Efficient power consumption and operating on lower voltage

Colors: White, Blue, Red, Green is a common choice.