1. Noise-cancelling microphone: BT headphones provide noise-cancelling microphone and noise reduction technology, with dynamic basic performance, so you can enjoy clear sound. 2. Good performance: Provides a truly natural and authentic sound and powerful bass performance. BT 5.1 technology ensures a strong and stable signal, faster transmission speed and lower power consumption. 3. Portable: Invisible design, smaller size, ultra-light, easy to use and carry. Get rid of the shackles and get more convenience for training, sports and other activities. The transmission distance can reach 10m. 4. Comfortable fit: X11 fits all ears perfectly. Fully symmetrical design, right and left ears fit, 105° included angle, ergonomic design, it doesn't hurt after five or six hours of use, very comfortable. 5. Button control: One button to control all functions, turn on, turn off, next song, play, pause, hang up, answer, reject, pair. Compatible with iPhone, Sony, Motorola, LG, laptop, etc.