High-quality signals and quick transmission speeds are provided by BT 4.2 technology. Connecting to BT-enabled devices is simple. equipped with a large 40mm drive unit, a superb titanium-plated diaphragm, and a clear treble and a startling bass. Use the 3.5mm audio cable (NOT included) to connect to audio devices (such as MP3/MP4, laptops, etc.) that do not have Bluetooth. Use a suspension earmuff and telescopic headband that can be lowered and raised to accommodate a range of head sizes. able to function as an MP3 player and accept a TF card (not included). facilitates FM radio operation. Additionally, you can download the NI A APP to adjust the sound and play music. Q2 Foldable On-Ear Wireless Headphones Over-Ear Bluetooth Earphones 3.5mm Music Earphone with AUX MP3 Player FM TF Card