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, a mute function is also included to protect personal privacy. 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.