Bluetooth Headband is made of moisture-wicking fabric, provide a soft and comfortable feeling. Fabric liner separated from stitching is not defective,it is the place to take out the Bluetooth module, so you can full wash the headband. Bluetooth Headband allows you to listen to your music without having to wear additional headphones, and protect you from being disturbed by your mess hair and sweat. Built-in microphone to let you won't miss any callings. Suitable for gym, workout, jogging, yoga and other outdoor activities. Also helps with insomnia, relaxation, meditation, travel and more. Best for Shift workers, tinnitus sufferers, and people who share a bed with a snorer.