Developed by Kygo, the E4/600 headphones use aptX Bluetooth 4.1 technology to ensure seamless connectivity while delivering superb sound quality The magnetic housing enables you to carry the headphones around your neck when not using them, without the fear of loosing or tangling them With a microphone and remote control incorporated, you can quickly and easily make and take calls while on the move Weighing just 20g, these can be taken or worn anywhere without even noticing Carry case and 3 sizes of silicone tips included.