This capacitive touch panel has 6 buttons and communicates via TTL Serial UART. It has a 1.6mm thick glass overlay with beveled edge that has reverse printed translucent white icons.
This glass graphic overlay was made this way so that when the lighted buttons are off, you can still see the button icons. When the button icons are illuminated, it lets the user know that the function has been enabled. Two of these buttons have 2 colors associated with them. White and Red colored LEDs were used to let the user know when a function is in an active state.