B&W MM1. System type: 2.0 system, Recommended usage: PC, Speaker placement: Tabletop/bookshelf, Portable. RMS rated power: 72 W, Frequency range: 38 - 22000 Hz. Amplifier output power: 72 W. Connectivity technology: Wired, Speaker interface type: USB, Headphone connectivity: 3.5 mm. Housing material: ABS synthetics, Aluminium