RF frequency from 1MHz to 6.5GHz for all FR frequency include GSM, WIFI BT, FM, VHF, UHF, 900 / 1200 / 2400 wireless audio and video transmission frequency.for home, office, hotel, car, bathroom, changing room, business negotiation, confidential session, factories, important workshop and research room, military installation, government agencies, entertainment venues or as a monitor for school examinations to prevent eavesdropping, being photographed, shooting videos or radiation dam