Description Feature 1: POWER USAGE MONITORING: This wattmeter plug easily measures power (watts), energy (kWh), volts, amps, Hz, power factor, and maximum power (watts), time, and days. It also calculates the cost of electricity over a specified period. Feature 2: DATA MEMORY FUNCTION: The power meter plug has a built-in 3.6V 40mAh rechargeable backup battery. It records your electricity consumption data even when unplugged, allowing you to retrieve the data when plugged back in. This is especially useful during power outages. Feature 3: OVERLOAD INDICATION: The electric power consumption meter features overload protection with a 3680W overload indication, alerting you if a device's power consumption exceeds the circuit's safe handling capacity. Feature 4: EASY TO USE: The electricity consumption monitor has 4 simple buttons for easy operation and parameter setting. The LCD screen is easy to read from any angle, making it ideal for monitoring the energy consumption of household appliances. Feature 5: APPLICABLE DEVICES: The energy meter plug easily calculates the power consumption of various devices, including computers, game consoles, printers, TVs, routers, ovens, toasters, set-top boxes, fans, air conditioners, DVD players, HiFi systems, etc. Item Type: Electricity Consumption Monitor Material: PC Plug: GERMAN Plug 230V Battery: 1 x 40mAh NiMH Button Type Rechargeable Battery (Comes with Built-in Battery) Wide Voltage Range: 150-276V Voltage Accuracy: 2% Power Display Range: 0.0-9,999W Power Accuracy: 2% Display Total Power: 0.000-9,999KWH Total Cost Display: 0.00-9,999 Electricity Cost Setting Range: 00.00-99.99/KWH Package List: 1 x Socket, 1 x Instruction Manual