The AKG K 4 is a pair of closed-back on-ear headphones designed for portable audio listening. They feature a lightweight and compact design, making them easy to carry around. The headphones have a frequency range of ... Hz and offer a balanced sound profile. They come with a detachable cable for convenience and have a foldable design for easy storage. The AKG K 4 headphones are suitable for casual listening and are available in different color options.