Used in the below situation:

1, power systems and power supply systems, radio, television, telecommunications, communications, radar, navigation, the Stock Exchange of staff, computers, copiers, electronic medical equipment, electronic access to the launch of the staff.
2, the high-frequency welding, hardening, melting, a thermal plastic, food drying, FM physiotherapy.
3, and often watch TV, the regular use of microwave ovens, vacuum cleaners, Electric blanket, mobile phones are.