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It can accurately display the power density of 800MHz to 2.7GHz (3.3GHz) high frequency electromagnetic waves.This frequency band is used in mobile radios, mobile phones, microwave ovens, digital pulse radio services and bro-tose, and wireless LANs. (Upper right side of main body right side next to model name print) Antenna cable connection socket (bottom right) Power: Power on/off, audio analysis, black plastic carrying case also stores log peri antennas for delivery.