NGS Roller Rocket, 20 W, Wired & Wireless, Graphite, Tube, Digital, Dust resistant, Water resistant NGS Roller Rocket. RMS rated power: 20 W. Connectivity technology: Wired & Wireless. Product colour: Graphite, Product design: Tube, Volume control: Digital. Recommended usage: Universal, Compatible memory cards: MicroSD (TransFlash). Battery type: Built-in battery, Power source type: Battery, Battery technology: Lithium-Ion (Li-Ion)