Channels: 2 (2.0) Maximum Power Per Channel: 50W Channel types: 2.0 / stereo The power interface: 5.5 * 2.5 plug The weight: 87 g (with copper column) Type: Home Amplifier 100% New and High Quality Models: 6 j1 tube (substitution model 6 au6 ak5, 6, 5654, etc.) Working voltage: communication AC12V 0.8 A or above Bravery former level, bravery buffer function: to add in the digital audio source such as colour: As shown Material: Pc+metal size: Circuit board size: 82 x 75 mm Package Contents: 1*6J1 tube preamplifier Diy kits 1*Instruction manual Note: This is Diy Kits.you need . 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.