Alesis M1 Active 330 USB, Active monitor system (stereo pair), With integrated 16 bit / 48 kHz USB audio interface, 3'' Aluminium woofer with bass reflex opening, 1"" Silk tweeter, Power: 2x 10W RMS, Frequency range: 80 - 20,000 Hz, Bass boost, Inputs: 2x RCA unbalanced, 2x 6.3 mm jack balanced, 1x 3.5 mm stereo jack, USB, Outputs: Headphone output with 3.5mm stereo jack, 3.5mm mono jack (for passive speakers), Dimensions (W x H x D): 127 x 188 x 147 mm, Total weight: 2.8 kg