iDonk Vibrating Speaker Bluetooth 3.5mm Stereo Jack 26watt - BLACK 26 Watts of Power for a powerful resonance and sound! Bluetooth for wireless connection, 3.5mm Audio jack input for wired connection 3.5mm Audio jack Output for you to chain up a few speakers so they can play together Aluminum Alloy construction for the best sound quality! Built-in Battery for 2-3 hours of cordless playback