ASUS SP-BT23, 2.0 channels, 4 W, 4 Ω, 70 dB, 150 - 20000 Hz, White ASUS SP-BT23. Audio output channels: 2.0 channels, RMS rated power: 4 W, Impedance: 4 Ω. Product colour: White, Driver unit: 2.5 mm. Battery technology: Alkaline, Battery type: AA, Battery voltage: 5 V. Weight: 400 g. Dimensions (WxDxH): 170 x 54 x 120 mm