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5V Electronic Hourglass DIY Kit Funny Electric Production Kits Precise with LED Lamp Double Layer PCB Board 84X40mm

Photos - Educational Toy 5V Electronic Hourglass DIY Kit Funny Electric Production Kits Precise with LED Lamp Double Layer PCB Board 84X40mm
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The suite adopts 1.6mm double layer PCB, and the circuit consists of 57 pieces warm white LED. Under the control of MCU program, it displays analog...
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