Features: Electricity usage monitor: Monitor is the killer of the high-cost energy appliance, helping you lower power consumption and save money. Digital LCD Display: Large clear LCD display for easy reading, the screen size is 47cmx60cm. Various Parameters: Power(W), Energy (kWh), Voltage, Amps, Power Factor, Cost and Minimum & Maximum Power, ideal for energy consumption monitor. Overload Protection: Once the whole power exceeds the rated power of monitor, LCD will display "OVERLOAD" with booming noise to remind the user Built-in Battery:With 3.6V rechargeable battery(NI-MH), It can store electricity. which allows meter to be moved and viewed without losing readings. Specification: Operating voltage: AC 110V Operating Frequency: 60Hz Wide voltage range: 110V-130V Operating current: 15A Max Wattage display: 0W-9999W Voltage display range: 0V-9999V Frequency display: 0Hz-9999Hz Current display: 0.0A---15.0A Cost display range: 0.00cost/kWh---99.99cost/kWh Timing display range: 0 second---9999 days Total kWh and cost display: 0.000kWh---999kWh,0.00cost---9999cost 7 Different Display Modes: Mode 1: Time/Watt/Cost Display Mode 2: Time/Cumulative Electrical Quantity Display Mode 3: Time/Voltage/Frequency Display Mode 4: Time/Current/Power Factor Display Mode 5: Time/Minimum Power Display Mode 6: Time/Maximal Power Display Mode 7: Time/Cost Display 1. With electricity expense calculating, you can monitor which appliance cost the highest energy and how much your standby appliances cost. In this way, you can determine how to low your power consumption. 2. With overload protect function, when the power socket connects the load over 1650W, LCD on the second will flicker. 3. If you receive the item and it do not power on or display, please plug it into the AC outlet for 10 minutes and press the reset button to reset. Package: Power meter *1 (US plug) User manual*1 Electricity usage monitor: Monitor is the killer of the high-cost energy appliance, helping you lower power consumption and save money. Digital LCD Display: Large clear LCD display for easy reading, the screen size is 47cmx60cm. Various Parameters: Power(W), Energy (kWh), Voltage, Amps, Power Factor, Cost and Minimum & Maximum Power, ideal for energy consumption monitor. Overload Protection: Once the whole power exceeds the rated power of monitor, LCD will display "OVERLOAD" with booming noise to remind the user Built-in Battery:With 3.6V rechargeable battery(NI-MH), It can store electricity. which allows meter to be moved and viewed without losing readings.