Faktor Zwei Mobile Music Stereo Lautsprecher Tray 20er Box 4Watt 4Ohm. RMS rated power: 4 W, Impedance: 4 Ом. Connector(s): 1x 3.5mm M, 1x USB M. Battery technology: Lithium-Ion (Li-Ion), Battery life (max): 6 h. Type: Portable speakers, Audio output channels: 2.0, Power source type: USB