Wireless Headphones KOSS BT/330i, Black:Enjoy listening to music without annoying cables. These Koss wireless headphones have the popular over-ear design. They sit comfortably over your ears, but they still have quite a compact design. The semi-closed construction will ensure perfectly clear sound, which sounds spectacular. These KOSS BT/330i, Black Wireless Headphones are made with Bluetooth for wireless connection to your device. Say goodbye to bothersome cables. These headphones even include a built-in microphone. These wireless headphones from Koss have 5.0 Bluetooth technology. This model can even receive calls. A fully charged battery will last you 12 hr(s). KOSS BT/330i, Black Wireless Headphones Key Features Material of these wireless headphones by KOSS BT/330i, Black: semi-closed Stylish black colour Cable can be easily removed for travel Connection method: Bluetooth Wireless connecting with Bluetooth gives you ultimate freedom Total weight of Koss wireless headphones is 270 g Full-charge battery life: 12 hr(s) These Koss wireless headphones also have a microphone Every user is sure to love the reliable microphone. The microphone on these Koss wireless headphones ensures uninterrupted voice calling with family or friends. This microphone is built directly into the headphones.