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BackBetween 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Memory Protection Devices P/N BC2AAPC, http://www.memoryprotectiondevices.com/datasheets/BC2AAPC-datasheet.pdf 2xAA cell battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery cell holder 2xAA cell battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder BH-331P Battery Type 3xAA Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch with LCD screen E3 SAxxxx switch normally-open pushbutton push-button LCD D MEC 5G single pole normally-open tactile switch with 6 positions D 3 pin Molex connector 2.54 mm spacing R23, R24, R25, R27 Switch, triple pole double throw Precision Timers, 555 compatible, PDIP-8"/>