Features:1. The maximum measurable power range is up to 120W.2. Powered by AAA battery / external USB port.3. LCD backlit display screen.4. One-button forward power / reflected power / VSWR ratio.5. Control layout is convenient and easy to operate.Specification:Frequency range: 125-525 MhzPower range: 0-120WInsertion loss: 0.3dB or lowerImpedance: 50 ohmsPower: Power: Battery "AAA" or Micro USB portWeight: approx. 303 g / 10.68 ozPackage list:1 * Standing Wave Meter Power Meter1 * English ManualBattery installation:1. Remove the black screw and open the cover of the rear panel.2. Can be used with alkaline or nickel-calcium, nickel-metal hydride rechargeable batteries.3. This unit does not have a built-in charging circuit.4. Be sure to correct the polarity of the battery.5. If you are not using the unit for a long time, remove the battery.