I'm selling this because I bought it but never had a chance to use it. It's new and unused, but it has been handled by a person once, so please refrain from purchasing if you are concerned. 【Product Description】 ◆ EXTRA BASS sound that produces powerful deep bass It achieves both overwhelming, powerful deep bass and clear high frequencies. Delivers a sense of realism directly. ◆ Stable Bluetooth connection with simultaneous left and right transmission By simultaneously transmitting Bluetooth signals from the player to the left and right sides of the main unit, high connection stability is achieved. Also, the lag between video and audio during video viewing is reduced. ◆ Water-resistant performance that is resistant to rain and sweat: With excellent water resistance equivalent to IPX4, you can enjoy music with peace of mind even if you get caught in sudden rain while you're out or sweat during sports or dance. ◆ Long battery life convenient for daily carrying 9 hours with the main unit alone, and a total of 18 hours with one case charge. It also supports quick charging, and you can play for 60 minutes with a 10-minute charge. ◆ Convenient Bluetooth function Hands-free calls are possible without taking out your smartphone, iPhone, or mobile phone. ◆ Stable Bluetooth connection with simultaneous left and right transmission By simultaneously transmitting Bluetooth signals from the player to the left and right sides of the main unit, high connection stability is achieved. Also, the lag between video and audio during video viewing is reduced. ◆ Functions and shape convenient for daily carrying Charging is possible by returning the earphones to the case when you are not listening to music. Magnets are used, so they fit easily into the correct position. It is a compact size and a lightweight case of about 46g, so you can easily carry it around. The buttons on the main unit allow you to control the music playback device, such as smartphones, to play/pause, skip forward/backward, increase/decrease the volume, and even answer or end phone calls. Based on ergonomics, the "Ergonomic Tri-Hold Structure" supports the ear at three points. The earphones fit snugly in the ear, providing a stable fit. ◆ Supports multi-pairing Supports multi-pairing that can be paired with up to 8 devices. If you pair it with frequently used devices once, Bluetooth connection from the second time onwards will be easy.