Westone Wx features a specially-tuned, single balanced-armature driver and Westone's High-Resolution Bluetooth Cable. The Single Driver Wx True-Fit Earphone delivers extraordinary detail and clarity. The compact, low-profile, and ergonomic design of the Wx takes advantage of all the innovations and expertise that Westone has developed in almost 60 years of designing and manufacturing products for the human ear. Whether exercising, commuting, traveling, or just relaxing and listening to your favorite music, the Westone Wx with Bluetooth Cable can be worn for hours. Control your world using the most advanced wireless technology available, the Westone Bluetooth cable features 3-button control and a built in microphone and pairs with most phones, laptops and tablets so you can stay connected with all your Bluetooth enabled devices.