100% New and high qualityUsing TDA2822M acts as amplifier chip, this chip is STMicroelectronics (ST) developed dual-channel monolithic amplifier IC, usually in the pocket cassette player (WALKMAN), tape recorders and multimedia speaker in for the audio amplifier.Simple circuit, good sound quality and wide voltage range.Color: greenMaterial: metalSupply voltage: DC 1.8-12VOutput : 0.1W-5W ;4-32 OhmsDimensions: 52 x 31 x 23mm (L*W*H)Input Interface: 3.5mm Audio inputAdjust form: volume adjustmentPackage Included:1x Amplifier ModuleNote: 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.