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BackMm, 1x10 Pin header, 2.54 mm, 1x2 (see [build notes](build.md)) | | | R31 | 1 | LED | Light emitting diode | | | J1 | 1 | SW_Push | Push button switch with Signal Lamp, generic K switch single-pole double-throw spdt ON-ON horizontal MEC 5G single pole triple throw, 3 position switch, SP3T K switch normally-open pushbutton push-button LED D MEC 5G single pole double throw D Switch, three position, single pole double throw Precision Timers, 555 compatible, PDIP-8 | | | | Tayda | A-826 | | | | Tayda | A-826 | | | | U2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>