This amplifier delivers clear sound across 11,800 sq.ft, suitable for groups up to 120 people. It features a 1800mAh battery providing 12 hours of amplification and 10 hours of music playback. It supports TF card and USB flash drive playback with options for song repeats and loops. The price drops from $34.99 to just $21.59 with code "SUPERSAVING". Shipping is free for Prime members. Else, it adds $6.