Alesis M1 Active MK3, Active 2-way bi-amp studio monitor, Woofer: 5 ""(127 mm) 40 Watt aluminum woofer, Tweeter: 1 ""(25 mm) 25 Watt silk tweeter, Amplifier: 65 watts RMS bi-amp Class A / B power amp, Frequency range: 45 - 22,000 Hz, Inputs: balanced XLR / jack combi input, Protection circuits: overheating protection circuit, Controls: volume control, on / off switch, Housing: Matte black soft-touch front, vinyl-coated MDF, Power supply: internal power supply 100 - 120/220 - 240 V AC 50/60 Hz, Dimensions: 183 x 216 x 267 mm, Weight: 5.49 kg, Including power cable and manual