Maximum Power Per Channel: NO POWER Channels: 3 (2.1) The product is a finished product colour:blue Material:metal size:98*40mm Package Contents: 1* 2.1 channel preamplifier board Only the above package content, other products are not included. Note: Light shooting 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.