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Https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D502.PDF battery CR-2477 coin cell battery CR-1025 coin cell vertical Cherry MX keyswitch, 1.25u, PCB mount, https://www.neutrik.com/en/product/nc3maav A Series, 4 pole male XLR receptacle, grounding: without ground / shell contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3fah1 A Series, 5 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, retention spring instead.