Nokia MD-11. System type: 1.0, Recommended usage: mobile phone/smartphone, Amplifier: Built-in. RMS rated power: 3 W, Frequency range: 150 - 18000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Interface: 3.5 mm. Power source type: Battery, Battery type: AAA, Battery life (max): 50 h. Width: 76.5 mm, Depth: 76.5 mm, Height: 50.2 mm