HamiltonBuhl® Flex-Phones™ are nearly indestructible, made from a single piece of EVA foam. EVA foam is safe, non-toxic, BPA-free, soft and an extremely flexible material. Recommended for children ages 3 and up, Flex-Phones™ are packaged with a snap-on extension band for smaller children -- just snap on the extension band for a snugger fit. Most importantly, the extremely clear sound quality will never exceed 85 decibels, ensuring young developing ears are protected. Details: Blue 3.5mm stereo plug 4 ft. cord length Drivers: 30 mm Impedance: 32 Frequency Response: 20Hz - 20KHz Sensitivity: 82dB ± 3dB Nontoxic BPA-free Made from EVA foam Ages 3+