These wireless headphones are with built-in microphone, * Two different sound safe volume settings of 85 dB and 95 dB for the perfect volume setting in any environment. * Built-in 500mAh battery provides up to 24 hours of play time * Fully charged in approximately 2 hours by Type-C USB charging cable * A working distance of 10 metres * Suitable for children aged 3+ * Extendable adjuster for customised flexible fit for any head shape * Lightweight, durable, foldable, flexible swivel design and comfortable while in use * Extra 3.5mm audio sharing cable included These headphones can be used with all your favourite devices  (i.e. use with iPads, ipods, Tablet, handheld games, learning devices, XBox, PS4, 2Ds XL and Nintendo switch*) when wired mode, using a 3.5mm 3.5mm universal jack connector audio sharing cable (included).   Speaker dimension: 40 mm Impedance: 32Rechargeable Battery: 500mAH, Lithium polymer battery  Play time: 24 hours  Operation Distance: 10