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There are two jacks in this module
border-radius:8px} Wired Miniature Electret Microphone
same as HC-SR04 PCB Dimensions 42 × 29 × 12 mm PCB Color Blue Operating Temperature -20°C to +70°C Waterproof Transducer probe only — PCB must be kept dry Compatible Platforms Arduino
4GHz radio transceiver and baseband
Controllable 4-Outlet Power Relay Module - AC Switch pointed tip There are two jacks inSimple Load Switching for Arduino, ESP32, and Automation Builds The Controllable Four Outlet Power Relay Module is a practical relay module from Circuitrocks for students, makers, and repair friendly builds. It fits well in projects that need switching external loads, while keeping setup straightforward for testing and prototype work. Compared with generic parts, this product stands out through details such as relay module. That makes it a solid
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