Crystal-Clear Party Music The boombox Ultra Bluetooth Boombox allows for TWS wireless pairing with 2 units, a USB player, and 3.5mm aux for easy connection. Old-School with an Upgrade Our old school boombox has an extreme rear bass radiator with bass and treble knobs to give you control over your sound, making it the perfect party speaker. The Ultimate Party Speaker The boombox Ultra comes with a carrying strap, charging block, remote control, 3.5mm Line In/Line Out, RCA Adapter and a 1-year manufacturers warranty. Ultra Loud, Ultra Light, Ultra Fresh Our lightest and smallest model still keeps it loud. This super portable model weighs only 7 pounds and features a bass radiator on the backside. Take advantage of the new TWS Wireless Pairing feature between two units. The Bluetooth and USB features make it easy to blast your music. Wireless Weighs only 7 pounds and features a bass radiator on the backside.