【100 Hours Continuous Operation & LED Battery Level Indicator】Compared to the previous version, the Bluetooth system and battery life have been improved. With a full charge of 1.5 hours, you can enjoy approximately 10-12 hours of talk time or music playback. Furthermore, to prevent loss of the earphones, a 500mAh charging and storage case is included, allowing you to 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 out surrounding noise, enabling clearer calls. You can deliver clear audio to the other party even in noisy environments. 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. Moreover, it can connect to two devices simultaneously, allowing you to separate your personal and work life, making it very convenient to answer calls from either phone. 【Ergonomic Design & Compatible with Both Ears】The Bluetooth earphone features an ergonomic, ultra-lightweight 12g design for a comfortable fit that won't fatigue your ears. It adopts an in-ear design, which, compared to other types, is secured deeper in the ear and supported by three points, making it less likely to fall out, allowing you to easily make calls even in crowded vehicles. Three sizes of replacement ear tips are included, allowing you to choose the size that fits your ears (S, M, L). The ear hook is adjustable (the telescopic part can rotate 270°) and the microphone boom can rotate 180° up and down. This single-ear earphone fits both left and right ears, allowing you to comfortably wear it on either side and enjoy calls and music playback.