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 HTS800 features special surge protection for coax cables used for satellite and cable TV connections. Other surge protectors Coax surge protection can result in as much as 20 to 30 dB of signal loss, which ultimately affects the output performance of coax connections. Monster's ultra-low loss RF circuitry provides virtually no signal loss to maintain peak performance.