supply voltage: DC 5V (do not press, pressing will burn the IC)Input : single-endedOutput : 5W 2Ohm 5V \/ 3W 4Ohm 5V \/ 1.8W 8Ohm 5VSize: 55.12mm x 32.26mmProduct weight: 25gProcess materials:Pure black immersion gold circuit board, KEMET audio capacitors, -capacity filter capacitors for each channel. Special order pure black pure copper terminal, gold-plated audio input terminal.performance:Efficiency: Greater than 90% harmonic distortion plus noise: Less than 10%low quiescent currentnoise suppressionProtection: input reverse protection, short circuit, overheating, EMIAdditional features:External amplifier type selection function (MODE: high level class D, low level class , factory default high level)Can be turned off externally (SD: the chip is turned off when the low level is low, and the factory default is high level)External mute (MUTE: low level mute, factory default high level)color:As shownMaterial:PCBPackage Contents:1 x Digital Amplifier BoardOnly 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.