The multi-functional socket can calculate the electricity cost and measure the power consumption, voltage, current, timing of the electrical appliances at the same time. Features: LCD screen design, easy to read the data and know the working situation. It has advanced feature of history bar graph of past days/weeks/months daily consumption. By pressing "ENERGY" button repeatedly, LED display will show Volts, Current in Amp, Power in Watt, Frequency and Power Factor. Simply plug the meter into the wall and then plug your appliance into the socket. Only to be used indoor, in dry condition and within max load. Specifications: Material: PC Plug Type: Three kinds of plugs (optional) Operating Voltage: EU: 230V ac US: 120V ac UK: 230V ac Frequency Display: EU: 50Hz US: 60Hz UK: 50Hz Wide Voltage Range: EU: 200V-250V US: 110V-130V UK: 200V-250V Operating Current: EU: Max 16A US: Max 15A UK: Max 13A Wattage Display(watts): EU: 0W-3680W US: 0W-1800W UK: 0W-2900W Current Display(amps): EU: 0.0A-16.0A US: 0.0A-15.0A UK: 0.0A-13.0A Price Display Range: 0.00€/KWH-99.99€KWH Total KWh and Cost Display: 0.000KWH-9999KWH, 0.00€-9999€ Battery: 2 x 1.5V LR44/AG13 button batteries (included) Item Size: 184 * 75mm / 7.24 * 2.95in Package Weight: 235g / 8.29ounce Package Size: 160 * 80 * 80mm / 6.3 * 3.15 * 3.15in Note: There are 3 kinds of plugs for your choice, please choose a specification that suitable for your country. Package List: 1 * Chart Power Measuring Socket 1 * User Manual