Visaton FR 8 WP. Driver size: 83.8 mm (3.3 "). RMS rated power: 15 W, Peak Music Power Output (PMPO): 25 W, Frequency range: 100 – 20000 Hz. Diameter: 80 mm, Weight: 0.23 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 90 x 90 x 49 mm, Audio output channels: 1.0