Versatile Playback: Connect wirelessly via Bluetooth or play music directly from a USB flash drive or TF memory card.Built-in Stand: The top of the chassis includes a convenient slot designed to hold your smartphone upright while it's playing.Portable & Rugged: Typically includes a carrying strap or shoulder strap. The casing is usually made of durable ABS plastic with a protective front metal grille.FM Radio: Features an integrated FM radio receiver.