A great little review from blogger Stephany over at https://stephanyssweetlife.wordpress.com/.
Stephany got hold of a set of Kidwavz KV100 headphones, specifically made for kids these feature wireless connectivity via Bluetooth as well as a volume limiting safety feature.
"Brainwavz Audio did a brilliant job when designing the KidWavz volume-limited Bluetooth children’s headphones. Every aspect of the headphones seems to be designed specifically with their child user in mind"
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Details on Kidwavz KV100