TOOGOO(R) TS-836A Plug Power Meter Energy Watt Voltage Amps Meter with Electricity Usage Measures various parameters: power (W), energy (kWh), volts, amps, hertz, power factor and maximum power (W), time, days - kWh is vital as this is what your electricity bills are based on! Large, clear LCD display for easy reading Overload Protection Function, overload warning; Cumulative Kilowatt-Hour Monitor; Calculates electricity expenses; Electricity price setting by pressing SET, VALUE, DISPLAY; Can also set energy Price for night separately Overload Protection Function: When the whole power exceeds the rated power of monitor, the monitor will cut off the current and prevent being damaged