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TTL/USB to NRF24L01 Wireless Serial Port Module$4.27 -
WEMOS ESP32 WIFI Bluetooth Module with 18650 Battery Holder + 0.96 Inch OLED Development Board$8.84 -
AC 70-500V 0.56" LED 2 Wires Digital Voltmeter Tester$1.01 -
8-Way Optocoupler Isolation Board$3.04 -
1/3/8 Channel 220V AC Optocoupler Module$0.75
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.16修改(3).png)
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