THE TARGUS SURGE PROTECTORS PREVENT YOUR EQUIPMENT FROM DRAWING MORE ELECTRICITY THAN WHAT THE POWER MULTIPLIER CAN HANDLE. THE SURGE PROTECTORS DISCONNECT FROM THE POWER, PREVENTING ELECTRICAL FIRES, AND EXTENDING THE LIFE OF YOUR EQUIPMENT BY ABSORBING THE DAMAGE CAUSED BY UNSTABLE VOLTAGE. THE USB SMART DETECTION AUTOMATICALLY DETECTS THE EXACT CHARGE REQUIRED BY THE CONNECTED DEVICES AND DELIVERS MAXIMUM CHARGING SPEED ACCORDINGLY.