ETSI EN 300 422-2 applies to equipment operating on radio frequencies between 25 MHz and 3 GHz, using analogue, digital and hybrid (using both analogue and digital modulation) modulation.

The present document applies to the following radio equipment types:

• Professional Wireless Microphone Systems (PWMS);
• in ear monitoring systems;
• consumer radio microphones;
• tour guide systems; and
• Assistive Listening Devices (Aids for the handicapped) comprising personal and public hearing aid systems.

The maximum power recommended for equipment covered by the present document is 250 mW for radio microphones and 500 mW for public hearing aids in the 169,4 MHz to 169,8125 MHz band (erp below 1 GHz and eirp above 1 GHz).

The present document also covers radio microphones used in the 863 MHz to 865 MHz band, with a maximum power of 10 mW.