With the new original TDA8954TH core technology, the BTL bridge circuit is more efficient.Adopt original original rectifier bridge, original J13003 transistorAdopt 2200uf array large capacity electrolytic capacitor.Kernel chip: TDA8954THInput power: recommended dual 24V toroidal transformer (range dual 12-double 18V)Output power: 420WNumber of channels: monoOutput impedance: 2-8 Ohm (4 Ohm recommended)Size: 82 * 72 * 37mmcolour: blackMaterial: metalNet weight: about 121gPackage Included: 1* 420W TDA8954TH Digital Audio power Amplifier BoardOnly 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.