85 dB volume for hearing protection: The on-ear headphones from gorsun protect boys and girls from hearing damage if they play at a limited volume of 85 dB over a long period of time. Designed for children over the age of 3 years. Great compatible with nearly all Bluetooth device by wireless connecting. In Line-in mode(wired status) do not need to power on the headphone and even you could use it without battery.For the best entertainment experience we use a long life battery that can play music for up to 12 hours. Safe and soft food grade material without any sharp corner protects your kids from any scratch injury. The headphone is durable which allows to be twisted or bent. Premium quality and no need to worry about kids' naughty behavior towards it.