The Koss KSC35s Wireless Bluetooth Ear Clips feature dynamic elements for an exceptionally wide frequency response of 15-25,000 Hz. They are the perfect headphone for the active listener, or for those who enjoy convenience for travelling. The ear clip headphones feature pivoting ear plates with soft foam ear cushions that guarantee an open hear-through sound and let you stay connected to your surroundings. Stay connected with up to 6+ hours of battery life and in-line microphone and remote. The KSC35 Wireless Bluetooth Ear Clip Headphones come equipped with a protective carrying case for when you need to grab them and go.