OTL Technologies Hello Kitty kids wired headphones are perfect for children aged 3-7 years as they are sound limited to 85dB (the recommended maximum sound limit for this age group). Note to grownups, these will sound quieter to you, but are suitable for young delicate eardrums! Compatible with all devices using a 3.5mm jack, these headphones feature the iconic Hello Kitty ear shape on the top of both earcups and the headband is padded and adjustable.