[Hands-free calling and MFB button] Bluetooth headset with built-in microphone, you can activate Sirri Assistant by pressing the MFB button, the Bluetooth headset adopts Bluetooth V5.1 chip, which provides clearer sound and stable connection. Use the MFB button to easily next song, stop music, answer, hang up and mute calls. [Bluetooth 5.1 Headphones & CVC 8.0 Noise Cancelling] The bluetooth headphones adopt Bluetooth V5.1, which can achieve faster and more stable mission. The mission distance can reach 10 meters. The wireless earphones use advanced noise reduction technology to produce high-definition sound quality. Noise-cancelling microphones reduce ambient noise and are perfect for noisy office environments. [Automatically pair & connect 2 devices at the same time] After turning on the Bluetooth for the first time, it will be automatically paired when the headset is turned on for the second time, without the need for a second connection operation. Simultaneously connect 2 devices including laptop, smartphone, iPhone, and Android. On the other hand, it increases your productivity and helps with multitasking. [Long standby time to avoid frequent charging]The built-in high-quality battery can play music continuously for 8 hours or talk time for 10 hours after being fully charged for 1.5 hours. This bluetooth headset is recommended for those who travel long distances. The earbuds are small in size and easy to carry, allowing you to put the earphones in your pocket. You can use a TYPE-C charging cable to charge your Bluetooth headset. (Note: The playback time may vary depending on the playback content, playback volume) [Comfortable to wear, universal for both ears]The ear hook is designed to fit the shape of the ear. The earphones are only 14 grams, which can relieve ear pain. In addition, the earphones can be rotated 180 degrees, and the ear hooks can be rotated 360 degrees. Based on the streamlined design of the ear wire, both left and right e