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BackBA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch for High-Density Packaging with Ground Terminal Middle Stroke Tactile Switch, http://www.helloxkb.com/public/images/pdf/TS-1187A-X-X-X.pdf Ultraminiature Surface Mount Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss SPST button tactile switch SPST right angle, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf tactile switch D reed switch, default-closed D SPDT reed switch K reed magnetic switch D Switch, three position, dual pole double throw | | C3, C4, C5 | 3 | 10uF | Electrolytic capacitor | | | | | J1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>