The Octane 9 (8) In-Built karaoke Trolley speakers are perfect for any party. This powerful little system packs a punch with 30 watts RMS of power. The 20.38 CM (8) woofer size delivers rich, full sound, while the audio & vocal recording feature lets you capture your performances for posterity. Plus, with 2087 built-in songs, you’ll never run out of tunes to sing! The 1800 mAh battery backup means you can keep the party going all night long.