1Digital LCD: This power metering socket has large clear digital LCD display for easy reading and it requires two 180mAh button batteries, which is shipped without batteries. 2For Energy Consumption: The power metering socket is the killer of high cost energy appliances, helping you reduce energy consumption and save money. 3Multi Functions:The energy monitor socket has overload alarm, power alarm, cost alarm, LED indicator and other alarm functions. 4Overload Protection: When the whole power exceeds the rated power of the display, the LCD will display "Overload", accompanied by a rumbling noise to remind the user. 5Various Parameters: Power, energy, voltage, amperes, power factor, cost, minimum and maximum power, which are ideal for energy consumption monitoring.