Media-Tech E-Zone LT. Recommended usage: universal, Form factor: tabletop, Amplifier: Built-in. RMS rated power: 4 W, Frequency range: 150 - 18000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Interface: USB. Power source type: Battery, Battery type: built-in, Battery technology: Lithium-Ion (Li-Ion). Width: 165 mm, Depth: 36 mm, Height: 70 mm