Feature 1ELECTRICITY USAGE MONITORING: Watt meter plug can easily measure power (watt), energy (kWh), volts, amps,hz, power factor and maximum power (watt), time, days and calculate how much electricity it costs over a cumulative period of time. 2DATA MEMORY FUNCTION: Power meter plug has a built in 3.6V 40mAh rechargeable backup battery, it will record your electricity consumption data even if you unplug it from the outlet; and you can continue to read the data after you plug it back in; this feature is very useful for dealing with sudden power outages. 3OVERLOAD INDICATION: Electrical power consumption meter has an overload protection function, 3680W overload indication, which will notify you if the power consumption of a unit exceeds the safe handling capacity of the circuit. 4EASY TO USE: Electricity usage monitor has 4 simple buttons that are easy to use and can set various parameters. The LCD display is easy to read from any angle. Ideal for monitoring the energy consumption of household appliances. 5APPLICABLE DEVICES: Energy meter plug is easy to calculate the power consumption of devices. Such as computers, game consoles, printers, TVs, routers, ovens, toasters, set top boxes, fans, air conditioners, DVDs, HiFi systems, etc.Item Type: Electricity Usage MonitorMaterial: PCPlug: GERMAN Plug 230VBattery: 1 x 40mAh NiMH Button Type Rechargeable Battery (Shipped with Built in Battery)Wide Voltage Range: 150276VVoltage Accuracy: 2%Power Display Range: 0.09.999WPower Accuracy: 2%Display Total Power: 0.0009.999KWHTotal Cost Display: 0.009.999Electricity Cost Setting Range: 00.0099.99/KWH .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Socket1 x Instruction Manual