[ Sound Technology ] Sound using Bluetooth 4.2 technology. High-quality built-in microphone software and high-definition sound technology provide you with high-fidelity stereo music and bass while listening to music and watching movies. [ Multimode ] Bluetooth Headset can work normally in wired and wireless modes. For wireless mode, the battery can use 10 hours of music time/talk time in one charge. You can also use it as a wired headset with an audio cable so that the headset will never turn off. [ Convenience ] Hands-free calling and built-in microphone provide a fast and stable connection for your Bluetooth equipment (mobile phone, tablet computer, personal computer and TV within 33 feet), and provide high-quality built-in microphone for hands-free calling, which is convenient for you to get rid of the shackles of cables. [ Texture Upgrade ] The upgraded soft ear pads and professional protein earmuffs are more durable and comfortable. Enjoy high-quality, long-term listening comfort, skin texture, lightweight and comfortable ear-encircling patch, which you can wear all day. Gentle reminder: Please take off your headphones every 2-3 hours and relax your ears to get better hearing enjoyment and keep your head comfortable. [ After-Sales Service ] Our headphones have a 45-day refund and an 18-month warranty. If you have any product problems, please contact our customer service department.