The Supniu A21 Portable Bluetooth Loud Speaker is a powerful sound system that delivers heavy bass and 360-degree sound quality. It features various audio inputs including USB, FM, AUX, Bluetooth, MemoryCard, MP3, and PC, suitable for different users' needs. The rectangular-shaped speaker in sleek black color is compatible with universal audio models and comes with a remote control for easy operation. With Bluetooth connectivity, wireless charging support, and 80W RMS power, this speaker is perfect for on-the-go music lovers looking for a high-quality sound experience. I have test this and it works perfectly. The sound that comes out of this speaker is amazing. It is super loud and doesn?t distort the sound like other ones I have heard.