Techly 108538, 2.05" (5.2 cm), 10 W, 80 - 20000 Hz, 4 Ω, 90 dB, Wired & Wireless Techly 108538. Driver diameter: 2.05" (5.2 cm). RMS rated power: 10 W, Frequency range: 80 - 20000 Hz, Impedance: 4 Ω. Connectivity technology: Wired & Wireless, Bluetooth range: 393.7" (10 m), USB connector type: USB Type-A. Product type: Stereo portable speaker, Product color: Black, Product design: Tube. Recommended usage: Universal, Compatible memory cards: MicroSD (TransFlash)