Features: 1. LCD Monitor: The electricity usage monitor has a large clear LCD screen that is easy to read and can be used with confidence 2. Electricity Usage Monitor: Helps you reduce energy consumption and easily conduct voltage and current power detection 3. Alarm Function: Features alarm functions such as overload alarm, power usage alarm, cost alarm, and LED light indication 4. Overload Protection: When the total power exceeds the rated power of the monitor, the LCD screen displays overload and emits an audible alert to notify the user 5. Various Parameters: Displays parameters such as power (W), energy (kWh), voltage, amperage, power factor, cost, minimum and maximum power Specification: Item Type: Watt Meter Material: ABS Product Size: Approx. 16 x 7 x 7.2cm / 6.3 x 2.8 x 2.8in Use: Power Measurement Socket Battery Type: Button Battery (includes built-in battery) Battery Chemistry: NiMH Battery Nominal Capacity (unit: mAh): 20 AC Frequency: 60Hz Operating Current: Maximum 15A Wattage Display (wattage): 0W to 1800W Current Display (AMPS): 0.0A to 15.0A Weight: Approx. 195g / 6.9oz Package List: 1 x Watt Meter Note: Shipped with built-in battery