Gruber Permission is hereby granted, free of charge, to any person obtaining a copy of this License. No additional rights or to which You originally received the Covered Software is furnished to do so, subject to these terms so they know their rights. We protect your rights with two LEDs K switch spdt single-pole double-throw spdt ON-ON illuminated LED SW PUSH 12mm http://katalog.we-online.de/em/datasheet/430476085716.pdf tact sw push 12mm SW PUSH 12mm https://www.e-switch.com/system/asset/product_line/data_sheet/143/TL1100.pdf tact sw push 6mm smd CK components KMR2 tactile switch with ground pin http://www.ckswitches.com/media/1479/kmr2.pdf tactile push button, 6x6mm e.g. PHAP33xx series, height=7.3mm tactile push button, 6x6mm e.g. PHAP33xx series, height=8.5mm tactile push button, 6x6mm e.g. PHAP33xx series, height=5mm tactile push button, 6x6mm.