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ESP32 Wifi Bluetooth 1-way/2-way/4-way/8-way Relay Module$5.34 -
3/4/5/6/7/8S 11.1~33.6V 18650 Lithium Battery Charger Protection Board$0.36 -
315M 1/2/4/8 Channel 12/220V Wireless Remote Control Switch Module$2.69 -
SDS011 PM2.5 Laser Sensor$16.95 -
AMS1117 3.3V LDO 800MA Step Down Power Supply Module$0.07
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