Maximum Power Per Channel: 100W Model Number: -MT21 Channels: 3 (2.1) size:93 x 90 x 22mm Material:plastic colour:black Package Contents: 1 x Amplifier Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.