The Koss Plug Wireless Bluetooth In-Ear Headphones with a rechargeable Battery lets you enjoy your music on the go with 6+ hour battery life. Get accurate high fidelity sound with memory foam cushions for superior comfort and noise isolation. Bluetooth 4.2 with in-line microphone and remote are included. The Bluetooth word mark is a registered trademark owned by Bluetooth SIG, Inc. and any use of such mark by Koss Corporation is under license.