Trevi XR 8A18, 2.05" (5.2 cm), 12 W, Wireless, USB Type-C, Black, Universal Trevi XR 8A18. Driver diameter: 2.05" (5.2 cm). RMS rated power: 12 W. Connectivity technology: Wireless, USB connector type: USB Type-C. Product color: Black. Recommended usage: Universal, Audio formats supported: MP3, Compatible memory cards: MicroSD (TransFlash)