Genius SP-i165. System type: 1.0, Recommended usage: universal, Form factor: Standard. RMS rated power: 2 W, Frequency range: 170 - 20000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Interface: 3.5 mm. Power source type: Battery, Battery life (max): 8 h, Battery technology: Lithium-Ion (Li-Ion). Width: 55 mm, Depth: 55 mm, Height: 64 mm