Features: 1LCD Monitor: Electricity usage monitor has a large clear LCD screen that is easy to read and can be used with confidence 2Electricity Usage Monitor: Electricity usage monitor helps you reduce energy consumption and easily conduct voltage and current power detection 3Alarm Function: Kilowatt meter has alarm functions such as overload alarm power usage alarm cost alarm and LED light indication 4Overload Protection: When the whole power exceeds the rated power of the monitor the LCD screen will display overload accompanied by a rumbling noise to remind the user 5Various Parameters: Watt meter has parameters such as power (W) energy (kWh) voltage amperage power factor cost minimum and maximum power Specification: Item Type: Watt MeterMaterial: ABSProduct Size: Approx. 16 x 7 x 7.2cm / 6.3 x 2.8 x 2.8inUse: Power Measurement SocketBattery Type: Button Battery (with built in battery delivery) Battery Type: NiMHBattery Nominal capacity (unit: mAh): 20AC Frequency: 60HzOperating Current: Maximum15A Wattage Display (wattage): 0W to1800wCurrent Display (AMPS): 0.0A to 15.0AWeight: Approx. 195g/6.9oz Package List: 1 x WattMeter Note: Shipped with Built in Battery