Panamax MR4300 offers several layers of surge protection. Patented Automatic Voltage Monitoring (AVM) technology continuously monitors the incoming power. In case of an undervoltage or brownout (too little electricity) or an overvoltage (too much electricity) a flashing red lightning bolt will be displayed and power to the equipment is automatically turned off. When voltage returns to a safe level, power to the equipment is automatically reconnected. The other layer of surge protection Panamax offers is our exclusive Protect or Disconnect technology. This ultra fast protection circuitry completely protects your equipment from surges such as lightning. When overwhelmed with extreme catastrophic events, Panamax permanently disconnects AC power to equipment. The MR4300 also protects cable/satellite and LAN/Ethernet connections.