Harmful power surges and voltage spikes can travel up the AC power line and damage connected equipment. Lightning, automatic garage doors, power tools, refrigerators and fluorescent lights all cause power surges and voltage spikes that affect phone lines and coax cables. Monster's Surge-Guard detects harmful power surges and voltage spikes before they reach components. This HTS 800 features special surge protection for coax cables used for satellite and cable TV connections. Monster's PowerCenter of ers high performance solutions for today's technology challenges. Now you can get protection from harmful surges, voltage spikes and inconvenience.