Gembird A4-AST-80IC. RMS rated power: 2 W, Frequency range: 20 - 20000 Hz, Impedance: 4 Ом. Speaker interface type: USB, Headphone connectivity: 3.5 mm. Diameter: 40 mm. Battery technology: Lithium-Ion (Li-Ion), Battery life (max): 4 h, Battery recharge time: 2 h. Type: Portable speakers, Dimensions (WxDxH): 70 x 70 x 37 mm, Audio output channels: 1.0