HamiltonBuhl Flex-Phones™ are made from a single piece of EVA foam. EVA is a safe, non-toxic, BPA-free, soft, flexible, nearly indestructible product. Flex-Phones™ are certified for international child safety testing standards and are recommended for children ages 3 and up. Most importantly, the extremely clear sound quality will never exceed 85 decibels, ensuring young developing ears are protected. 3.5mm stereo plug. Available in blue, black and red. Compatible with: iPods, iTouches, MP3 players, iPhones, Cell Phones, iPads, Tablets, eReaders, PCs and Macs, CD players, Stereos and TVs. Choose from red, blue or black.