BTS-836A Plug Power Meter Energy Watt Voltage Amps Meter with Electricity Usage Monitor, Reduce Your Energy Costs ReviewbP PP TS-836A Plug Power Meter Energy Watt Voltage Amps Meter with Electricity Usage Monitor, Reduce Your Energy Costs PMeasures 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!PLarge, clear LCD display for easy readingPElectricity price setting by pressing COST, FUNCTION, UP and DOWN button according to the instructionsPBuilt-in Battery(3.