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This RJ11 surge protector is specially designed for telephone line lightning and surge protection, compatible with landline phones, fax machines and DSL modems. It can quickly absorb instantaneous overvoltage induced by thunderstorms and power fluctuation, isolating surge current to protect your communication equipment from damage. Standard RJ11 pass-through design enables direct series connection on the telephone line for instant protection. Durable insulated shell and built-in multi-level safety discharge circuit ensure stable and reliable performance for long-term home and office use.