Visaton DL 5. Driver size: 50.8 mm (2 "). RMS rated power: 4 W, Peak Music Power Output (PMPO): 10 W, Frequency range: 150 – 20000 Hz. Diameter: 53 mm, Weight: 0.16 kg. AC adapter output voltage: 100 V. Operating temperature range (T-T): -40 - 110 °C