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BackCR2 A battery holder Keystone type 3009 coin cell vertical Panasonic CR-2450/VAN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D492.PDF battery CR-2450 coin cell retainer Keystone type 3001 coin cell vertical Cherry MX keyswitch, 1.00u, PCB mount, additional ground contacts, https://www.neutrik.com/en/product/nc3fbh2-e B Series, 4 pole chassis connector, grey D-size flange, mirrored self tapping screw holes (A-screw), horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3fbh1-b B Series, 3.