Amazon Description fiio x1 DAP Overwhelming cost performance as an entry-class Hi-Res music player. Inherits most functions from X3/X5 except for DSD playback and USB-DAC function. Equipped with various functions to improve convenience, such as memory playback, folder-through playback, gapless playback, key lock, automatic shutdown, and sleep timer. Supports various formats such as FLAC/APE/ALAC/WAV/WMA/AAC/MP3. Equipped with a microSD card (SDHC/SDXC) compatible card slot [up to 128GB]. fiio A3 portable headphone amplifier The FiiO A3 portable headphone amplifier is a renamed model that succeeds the FiiO E11K, which has received high praise for its cost performance and solid performance as a portable amplifier. Passing through a pure analog amplifier input/output circuit, the A3 gives more driving power to signals from music players and smartphones. It has been recognized for its reliable performance as a portable amplifier since the E11K. The well-regarded OPA1642 preamplifier and AD8397 power amplifier combination is inherited from the E11K, and the newly added silver color boasts excellent compatibility with the company's Hi-Res player X1. The FiiO A3 will maximize the potential of the connected devices and upgrade your portable listening environment. The DAP and amplifier are attached. For those who understand!