STEREO FUNCTION when paired with a second unit second unit sold separately. Wireless speaker. Unique design on the front and LEDs inside flashing with the music. Speakers output power: 3W for high quality sound. AUX IN jack, USB and SD/TF cards ports supports up to 32GB to listen to your music very easily. Up to 6 hours of listening time. Mini USB charging port to charge your speaker, USB cable included. Warranty: 2 years