UNE-EN 60118-4:2007 Electroacoustics - Hearing aids -- Part 4: Induction loop systems for hearing aid purposes - Magnetic field strength (IEC 60118-4:2006).
2016UNE-EN 60118-4:2016 Electroacoustics - Hearing aids - Part 4: Induction-loop systems for hearing aid purposes - System performance requirements
2007UNE-EN 60118-4:2007 Electroacoustics - Hearing aids -- Part 4: Induction loop systems for hearing aid purposes - Magnetic field strength (IEC 60118-4:2006).