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PROFESSIONAL 4-PIN STEREO ADAPTERS: Easily convert bare wires into AUX cables or repair damaged plugs/sockets with these professional-grade 3.5mm screw terminal connectors. Supports stereo audio + microphone signals (TRRS) via the 4-pin terminal block. NO SOLDERING REQUIRED: Secure wires effortlessly using the built-in screw clamp terminals – simply loosen screws, insert stripped wire ends, and tighten. Ideal for quick DIY fixes, projects, or custom cable creation without specialist tools. COMPLETE 4-PIECE KIT: Includes 2x male 3.5mm plug connectors and 2x female 3.5mm socket connectors – perfect for creating extension cables, replacements, or custom audio solutions. VERSATILE DIY APPLICATIONS: Connect smartphones, tablets, or MP3 players to amplifiers, speakers (replace damaged cables), Raspberry Pi, Arduino boards, car stereos, or repair AUX cables with loose contacts. Use for audio projects, measurements, or custom installations. CLEAR POLARITY GUIDANCE: Each terminal block features clear +/- markings for Left/Right/Mic/Ground wires, ensuring correct connections and optimal stereo sound quality. Refer to included polarity diagram during installation.