Supply voltage: DC 5V (Do not overvoltage, overvoltage will burn IC)Input : single-endedOutput : 5W 2 5V 3W 4 5V 1.8W 8 5VProduct weight: 25gEfficiency: more than the 90% Harmonic Distortion plus Noise: Less than10%Low quiescent currentNoise suppressionProtection: reverse supply input protection, short-circuit, overheat, pass EMIAdditional features:External amplifier type selection function (MODE: high level D, low level , factory default high level)External Shutdown (SD: Chip Shutdown at Low Level, Factory Default High)Can be muted externally (MUTE: low-level mute, factory default high)Colour:blackMaterial:plasticSize:55.12mm*32.26mmPackage Contents:1* audio 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.