TS-836A Plug Power Meter Energy Voltage Amps Electricity Usage Monitor,Reduce Your Energy Costs Warranty: Floureon TS-836A Electricity Usage Monitor has 12-month warranty and 100% friendly customer service. Easy to Monitor Your Electricity Bill: Electricity price setting by pressing COST, FUNCTION, UP and DOWN button (Electricity price range: 00.00COST/KWH - 99.99COST/KWH). Measure Various Parameters: Power (W), Energy (kWh), Volts, Amps, Wattage, Hertz, Power Factor and Maximum Power (W), Time, Days ( Your electricity bills are vitally based on kWh) Large & Clear LCD Display for Easy Reading: 1.77 x 2.76inch (4.5 x 7cm). Built-in Battery Backup: 3.6V rechargeable battery allows meter to be moved and still visible without losing readings.