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The front side of the PCB can be seen with the words A and B
over-discharge protection and short circuit protection
3V DC (I/O)
The resistor circuit symbols are usually enhanced with both a resistance value and a name
High Sensitivity Mini Cctv Security Surveillance Microphone – Audio Input For Ip Cameras, Dvr & Nvr Systems (50–150m² Range) refurbished IGBT The front side of theProduct Description Enhance your security system with this high sensitivity Mini CCTV Surveillance Microphone, designed to deliver clear and accurate audio monitoring across an area of up to 150 square meters. Ideal for WiFi IP cameras, DVRs, and NVR systems, this compact microphone captures even the faintest sounds, making it perfect for offices, shops, parking areas, and home surveillance setups. With a wide frequency range and high signal to noise
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