The Boya BY-K4 is a compact audio adapter designed to bridge the gap between modern devices and traditional audio gear. By converting a USB Type-C output into a 3.5mm female jack, it allows you to connect standard headphones or microphones to smartphones and tablets that lack a dedicated headphone port. This black adapter features a minimalist design with a durable plastic housing and a very short 0.06m cable, ensuring it stays unobtrusive and doesn't tangle while you use your device. It is a practical tool for anyone needing a simple, reliable way to restore wired audio connectivity to their USB-C hardware.