... General information The product is a High-frequency power meter having good performance and carried conveniently, especially designed for ... )Battery7.2V lithium batteryWork timeaverage>24 hours ,series>12 hoursPower adapter100-240V/0.8A 50-60HzCharge timeabout 5 ... , accuracy is ??.2dB;Internal rechargeable battery, last for 12 hoursExternal power sensor, make the measure easierOptional attenuator can ...