Visaton BS 76. Driver size: 76.2 mm (3 "), Mid-range driver size: 76.5 mm. RMS rated power: 20 W, Peak Music Power Output (PMPO): 30 W, Impedance: 8 Ом. Weight: 0.41 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 76.5 x 76.5 x 31 mm, Audio output channels: 1.0