The ATH-CK200BT in-ear headphones give you excellent wireless audio at a great price. The powerful 9 mm drivers deliver clear, vibrant audio from a Bluetooth wireless signal, while the compact housings and interchangeable ear tips (XS, S, M, L) provide good sound isolation and a comfortable, customizable fit. The headphones feature an in-line mic and controls, allowing you to answer calls, adjust volume and control music playback on compatible smartphones and other devices. The ATH-CK200BT's design conveniently situates the mic 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 internal battery powers the headphones for up to 7 hours (200 hours standby) and can be recharged with the included 30 cm (1') USB charging cable. Available in black (ATH-CK200BTBK), blue (ATH-CK200BTBL) and white (ATH-CK200BTWH). The Bluetooth word mark and logos are owned by Bluetooth SIG, and any use of such marks by Audio-Technical Corporation is under license. Other trademarks and trade names are those of their respective owners.