The Audio-Technica M20xBT are over-ear wireless headphones that take the sound of the wired M20x headphones into the world of portable listening. Punchy 40 mm drivers ensure that the M20xBT keep their detailed and full sound with enhanced bass. With the M20xBT's efficient design, you also get an on-board microphone for making calls, control buttons, and an optional cable for wired connections. The M20xBT offer a range of innovative features, including multipoint pairing that lets you wirelessly connect up to two devices at once for multimedia experiences, and low latency mode to ensure your audio and videos remain in sync. These wireless headphones also boast up to 60 hours of continuous use from a full charge or can operate for three hours on a rapid 10-minute charge. The M20xBT's soft, padded earcups and headband make sure that you get a comfortable fit for long listening sessions, so wherever you need to travel to, and how long you want to listen, they'll be right with you.