1、Digital 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. 2、For Energy Consumption: The power metering socket is the killer of high cost energy appliances, helping you reduce energy consumption and save money. 3、Multi Functions:The energy monitor socket has overload alarm, power alarm, cost alarm, LED indicator and other alarm functions. 4、Overload 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. 5、Various Parameters: Power, energy, voltage, amperes, power factor, cost, minimum and maximum power, which are ideal for energy consumption monitoring. 1 x Watt Meter1 x Manual Item Type: Watt MeterMaterial: ABSGross Weight: 196g/ 6.9ozProduct Size: 6.6x 13.6x6cm/ 2.6x 5.4x 2.4inPlug: US plugWorking Voltage: 120V acFrequency Display: 50HzWide Voltage Range: 120VWorking Current: Max. 15ACurrent Range: 0.005A-15APower Supply Range: 1W-1800WBattery: 2PCS Button battery, L1154F 180mAh, capacity of one, delivered without battery