ULT Button: Press the ULT button to feel the Deep Bass with ULT 1 & Massive Bass with ULT 2. SONY New Launch ULT Tower 10 Party Speaker with ULT Button(2 Modes) for Massive Bass and Powerful Sound, 360 Sound & Party Lights, Wireless Mic for Karaoke, Bluetooth, Touch Panel, TV Sound Booster.
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