Visaton FR 10 WP. Driver size: 101.6 mm (4 "). RMS rated power: 20 W, Peak Music Power Output (PMPO): 30 W, Frequency range: 80 – 16000 Hz. Diameter: 100 mm, Weight: 0.275 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 132 x 132 x 56 mm, Audio output channels: 1.0