ESP Digital QC Surge Protector/Noise Filter - D5143NT - 120 Volt, 20 Amp with NEMA 5-20 Connectors 120 volt, 20 amp with NEMA 5-20P Input Plug, (1) 5-20R outlet, (2) 5-15R outlets, (RJ-45) network protection, (RJ-11) phone line protection. VERY IMPORTANT: Please look at photo to confirm your plug type. This model will only work with a NEMA 5-20R electrical outlet. It will not work with a standard 15 amp household electrical circuit. Industrial-grade surge and noise protection: protect sensitive electronics from lightning strikes, surges, transients, noise, over voltage, and wiring faults. Special filter circuits screen electrical noise to prevent disruption, data loss and phantom performance problems.