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DC5V 9025 Double Ball Cooling Fan with XH2.54 2P 30CM Cable Size*90*25MM USB Charger Doctor for Voltmeter and Ammeter Recalibrate whenever switching to significantly Recalibrate whenever switching to significantly different track materials or lighting conditions to maintain accurate line detection consider using rechargeable NiMH batteries or installing additional backup batteries in series to extend backup duration DC5V 9025 Double Ball Cooling Fan with XH2 54 2P 30CM Cable Size*90*25MM
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