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BackFor 2020, 2025 and 2032 coincell batteries. Http://www.keyelco.com/product-pdf.cfm?p=798 Keystone type 105 battery holder Keystone type 103 battery holder with leaf spring, Keystone, https://ken.keyeuro.eu/cat/590.pdf AA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder 18650 Battery Holder SMD Tactile Switch, https://www.e-switch.com/system/asset/product_line/data_sheet/165/TL3342.pdf SWITCH SMD KSA SW 4-bit rotary coded switch, through-hole, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SPST Off-On Pushbutton, 1A, 30V, CW Industries P/N GPTS203211B, http://switches-connectors-custom.cwind.com/Asset/GPTS203211BR2.pdf SPST button switch Off-On CuK sub miniature slide switch, vertical, SMT J bend https://dznh3ojzb2azq.cloudfront.net/products/Slide/JS/documents/datasheet.pdf MEC 5G single pole double throw, separate symbols | | | S1 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | | | C7, C12 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS)"/>