Patent ID: 8797174

Claim:
An extension cord with environmental condition sensing ability and having a plug for connecting to a power source, comprising: a main body, including: a first socket group, provided on the main body for connecting of a first electronic device, wherein the first socket group is permanently directly electrically connected to the power source via the plug such that the first electronic device is constantly supplied with electric current; and a second socket group, provided on the main body for connecting of a second electronic device, wherein the second socket group is selectively electrically connected to the power source via the plug such that the second electronic device is selectively supplied with electric current; a current control unit, turning on or cutting off electric current being supplied to the second socket group for controlling the second socket group being electrically connected to the power source or not; and a sensor unit, connected to the current control unit to form an electric circuit together and disposed near the second electronic device to sense whether a user is present near the second electronic device or not by determining values of environmental condition and thereby generating a signal, wherein the environmental condition is a light condition, a supersonic wave reflection condition, or a temperature condition, while the value of the temperature condition is lower or intensity value of the light condition is increase, the sensor unit senses the user is not present; wherein, if the sensor unit senses the user is present, the current control unit turns on the electric current being supplied to the second socket group by the signal generated from the sensor unit, such that both the first socket group and the second socket group are supplied with the electric current; and if the sensor unit senses the user is not present, the current control unit cuts off the electric current being supplied to the second socket group by another signal generated from the sensor unit, such that only the second socket group is not supplied with the electric current, while the first socket group is supplied with the electric current regardless of the user is present or not.