Visaton FRS 7. Driver size: 63.5 mm (2.5 "). RMS rated power: 8 W, Peak Music Power Output (PMPO): 15 W, Frequency range: 200 – 20000 Hz. Diameter: 60 mm, Weight: 0.2 kg. Type: In-wall/On-wall/In-ceiling speakers, Dimensions (WxDxH): 66.5 x 66.5 x 31 mm, Audio output channels: 1.0