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BackPlastic Case, http://www.keyelco.com/product-pdf.cfm?p=1031 AAA battery holder Keystone #500, CR1220 battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, Keystone, Plastic Case, http://www.keyelco.com/product-pdf.cfm?p=1031 AAA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder BH-331P Battery Type 3xAAA Keystone Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch, B3SL Middle Stroke Tactile Switch for High-Density Packaging with Ground Terminal, with Boss Ultra-small-sized Tactile Switch for High-Density Packaging with Ground Terminal, with Boss SPST button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | | | R4, R6, R7, R30, R31 | 1 nF | Unpolarized capacitor | | Tayda | A-1605 | | Tayda | A-804 | | R23, R24, R25, R27 Switch, triple pole double throw Precision Timers, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14"/>