Visaton FRS 10 WP. Driver size: 101.6 mm (4 "). RMS rated power: 20 W, Peak Music Power Output (PMPO): 30 W, Frequency range: 90 – 19000 Hz. Diameter: 100 mm, Weight: 0.36 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 115 x 115 x 51 mm, Audio output channels: 1.0