Handmade speaker from Swedish brand Transparent Sound in black from a single piece of recycled steel. Integrated class D active amplifier. Includes long and short 3.5 mm audio cable, USB-C power cable and wall bracket. Product features Bluetooth 5.0, wireless stereo streaming Compatible with Apple AirPlay, Sonos, Amazon Echo and Google Cast Integrated digital signal processing 140 W output power 35 Hz - 20 kHz ± 5 dB frequency response 3.5 mm AUX line-in connection on the front and bottom User-supplied USB-C power supplies must support one or more of the following output levels: 12 V/3 A, 15 V/3 A, 20 V/2.25 A