CARD20 is the world s slimmest TWS Bluetooth headphones combining classy look, sublime comfort and unparalleled audio performance. The patented layout of the built-in antenna and the seminal cutout design of the charging case squeeze the total thickness of the earbuds and the case to a mindblowing 0.5in in striking contrast to at least 1in of others. Each component is strategically arranged based on the form of over thousands of human ears to dramatically improve its universal comfort, fit and stability.