85dB is a safe hearing level suggested in various European Union Safety Standard such as EN60065 and EN 60950-1. For kids it is suggested to further lower the volume to 50%-75% of the volume bar of your audio device for better hearing protection.
Control and shorten the length of time
Long exposure to noise or loud music playback may cause hearing loss. It is suggested to limit the time of using headphones to a maximum of 2 hours a day for kids.
Use audio device which complies with European Union Standard EN 60950-1
The latest European Union Safety Standard EN 60950-1:A12 requires portable entertainment products such as MP3 player to equip with a sound volume limit alert feature. It is suggested to purchase a device which complies with the latest European Union Safety standard to give the best protection to your kids.