Designed for children ages 4-12, Philips K4607GY adds a whole new dimension of fun without limiting kids' freedom. Bone conduction technology promotes comfort, safety, and awareness. The open ear design allows kids to hear what's going on in the background and respond to parents' calls without having to take off their headphones. Volume is limited to 85 dB to prevent hearing loss, and parents can set playtime limits via the Philips Headphones App. The internal microphone cuts out background ambient noise, so whether kids are playing games on their ipads, attending online lessons or talking on the phone, their voices will always be crystal clear. Another unique feature parents that parents will love is the flexible, adjustable headband, which is ingeniously designed to expand as kids grow older, eliminating the need to purchase additional headphones. With an IPX5 rating, these headphones can handle sweat, splashes and spills. Kids can play their favorite tunes while enjoying an afternoon at the beach or pool. When the battery runs low, just plug in the USB-C cable to recharge.