HUAWEI FreeBuds 4E True Wireless Bluetooth Earphones Semi-open in-Ear Earbuds Active Noise Cancelling Headphones - Silver Semi-open in-ear design, with good ventilation, brings a more comfortable wearing experience With human ear adaptive noise low-frequency noise, moderate reduction of external-frequency noise Equipped with AEM human ear adaptive sound technology, intelligent optimization of sound quality according to the shape of the ear canal and wearing state When the cover is opened, it can be paired with the nearby mobile phone, tablet, or PC automatically popup window, and can be connected with two devices at the same time, audio can be switched between devices in real-time 14.3mm diameter wide range of voice unit, sound frequency range up to 40kHz, so that the treble is transparent and full, every note accurately ear Rich headset sliding touch operation, so that you do not need to take out the phone frequently during use, adjust the volume or answer the phone The single ear is only about 4.1g, and the weight is reduced by 10%, making you enjoy the "air feeling" wearing experience Specifications: Bluetooth: V5.2 Wearing method: semi-in-ear, true wireless Charging time: the case charges the earphones: about 60 minutes, and the empty case wired charging: about 60 minutes Battery capacity: earphone: 30mAh; charging case: 410mAh Playing music and talking (earphones are fully charged): Listening to music: 4 hours (noise reduction off), 2.5 hours (noise reduction on) With the charging box: Listening to music: 22 hours (noise reduction off), 14 hours (noise reduction on) Package included: 1 x Pair of Bluetooth Earphones 1 x Charging Case 1 x USB-C Charging Cable 1 x Chinese User Manual