A-szcxtop MINI503 Bluetooth Stereo Headset Headphones Deep Bass Effect Wireless Headphones On-Ear Headphones Adoption of high speed Bluetooth V2.2+ EDR standard, to ensure high quality and pure stereo sound transmission High-speed transmission in 10 meter (Class 3 standard) portable and wireless Innovated double damping balance technology, present perfect music Connect the power charging ports with a power source (via USB charging cable or AC Adapter) A-szcxtop is designated as the only authorized dealer