TRIPP LITE TLP4BK Direct plug-in 4 Outlets 720 Joules Protect It! Surge Suppressor Outlets Type: NEMA 5-15R Voltage Compatibility: 120V AC EMI/RFI Noise Filter: Up to 20dB Clamping Voltage: 330 Volts Protection Modes: Includes full normal mode (H-N) and common mode (N-G/H-G) line surge suppression Certifications: UL1449 with fail safe circuit, FCC Part 68 (Communications), cUL, RoHS Color: Black Unit Dimensions: 3.26 x 5.80 x 1.86