The X5 is an android-based portable music player. When playing lossless music, it can provide a premium music experience to the music lovers and support a DSD format. The design is made according to the requirements of the audiophile, adding the frequently used roller to adjust volume and provide a much more convenient music playback when using with other buttons. The roller is protected by the border that can prevent misoperation and becomes an integrated part of the player. Each detail is designed to improve the user experience. No matter if it’s the smooth edge or the ridges or the cutting on the side, they all can provide a better user experience.