Technaxx Hello Kitty Musicbox. System type: single speaker, Recommended usage: universal, Driver size: 45 mm (1.77 "). RMS rated power: 6 W, Frequency range: 150 - 18000 Hz, Impedance: 4 Ом. Connectivity technology: Wired. Power source type: AC, Battery, USB, Battery voltage: 5 V, Battery life (max): 3 h. Width: 160 mm, Depth: 50 mm, Height: 50 mm