I used it once, but the feel was different from what I expected, so I'm selling it! 〇 I have used it once, so please refrain from purchasing if you are concerned about that m(_ _)m 〇 Returns and exchanges are not accepted. 〇 If you have any questions, feel free to comment! ……………………………………… ▽ Quoted from the purchase site below Brand: Boytond Color: Black Ear Placement: Over-Ear Headphone Type: Over-Ear Impedance: 13 ohms Noise Control: Active Noise Cancellation 【Ultra-Long Battery Life】Compared to the previous version, the Bluetooth system and battery life have been improved. With a full charge of 1.5 hours, you can make calls for about 10-12 hours and play music continuously for about 10-12 hours. In addition, to prevent the loss of the earphones, a 500mAh charging and storage case is included, which can fully charge the earphones about 5-7 times repeatedly. 【Built-in Hands-Free Calling Microphone & Mute Function】The Bluetooth headset is equipped with a single-directional microphone and CVC8.0 noise-canceling function, which accurately picks up your voice and blocks noise from the surroundings, enabling clearer calls and 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. 【Ergonomic Design & Compatible with Left and Right Ears】The Bluetooth earphones are designed with an ergonomic 12g ultra-lightweight design, making them comfortable to wear and less likely to cause ear fatigue. They adopt a canal type, and the design that supports the ear with three points, fixing it deeper in the ear than other types, makes it less likely to fall out of the ear, allowing you to talk comfortably even in crowded trains. Three sizes of replacement ear tips are included, so you can choose according to the size of your ears (S, M, L). The ear hook is extendable (the extendable part can rotate 270°) and the microphone boom can rotate up and down 180°. This single-ear earphone fits both left and right ears, allowing you to wear it comfortably on either ear and enjoy calls and music playback. Web conference earphones with microphone, USB Bluetooth 5.4 compatible, compatible with PC/tablet, adapter Bluetooth dongle