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This BNC female to female coupler serves as a signal extender for security camera coaxial wires. It links two male BNC cable ends together to extend monitoring transmission distance without complicated wiring tools. High-purity conductive cores stabilize video signals and avoid screen flicker or color distortion in surveillance footage. The robust metal housing shields external electromagnetic interference, suitable for home monitoring, commercial store camera systems and factory security projects. Coaxial cables and cameras are not included.