The ATH-CK200BT Bluetooth In-Ear Headphones from Audio Technica give you excellent wireless audio at a great price. The powerful 9 mm. drivers deliver clear, vibrant audio from a Bluetooth wireless signal. These black Bluetooth earbuds conveniently situate the microphone and controls for easy access and places the battery case on the upper back where, if desired, it can be attached to your shirt collar with the included clip. The compact housings and interchangeable eartips (4 sizes) provide good sound isolation and a comfortable, customizable fit.