Ideal for both home and office protection, the CyberPower CSB404 Essential Surge 4-Plug Surge Protector will guard your delicate electronic devices from the power surges and line abnormalities that come with plugging them directly into the wall. With EMI/RFI filters that "clean" the signal of electronic noise, and an auto-shutdown feature that protects your devices from overload, you can't afford not to guard your electronics with this 4-port surge protector.