ThinkSound in20 In-Ear Headphone with Mic power accessories QOA is a short form

QOA is a short form for Queen Of Audio

If you want to use the MMCX cable that is provided in the box

HIGH-END STUDIO QUALITY

Output: Bluetooth Specification Power Class 2

ThinkSound in20 In-Ear Headphone with Mic power accessories QOA is a short formThe Next Generation The in20 is the latest in ear headphone in our award winning thinksound line. It combines the best of everything in a small package with big sound. Its our most versatile headphone yet and is engineered to have a smooth sound signature via upgraded acoustics so you can listen for hours on end. The gunmetal aluminum baffle is mated to a hand crafted, sustainable walnut housing to give it that distinctive thinksound character.