Blue 【Extended Battery Life】Compared to the previous version, the Bluetooth system and battery life have been improved. A full charge takes 1.5 hours. In addition, to prevent the loss of the earphones, a 500mAh charging case is included, which can fully charge the earphones about 5-7 times. 【Dedicated Hands-Free Call Microphone & Mute Function】The Bluetooth headset is equipped with a unidirectional microphone and CVC8.0 noise-canceling function, which accurately picks up your voice and blocks noise from the surroundings, enabling clearer calls, delivering clear audio to the other party even in noisy places. In addition, to protect personal privacy, a mute function is also included. During a call, pressing the "MFB key" will prevent the other party from hearing your voice, which is convenient when handling confidential information, such as during a meeting.