SMAKN® Mini PAM8403 5V Audio Ampli Digital Amplifier Board Support USB Powered Two Channel Stereo Amp 3W+3W<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> PAM8403 Mini Power Amplifier Board. </span></li><li><span class="a-list-item"> Dimension:30 x 22 x 16mm (do not including potentiometer handle) </span></li><li><span class="a-list-item"> Operating voltage: DC 2.5-5.5V </span></li><li><span class="a-list-item"> Max output: 3Wx2 (5V 4Ω) </span></li><li><span class="a-list-item"> Max output: 3Wx2 (5V 4Ω) Efficiency: 90% </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41hUGhTI7sL.jpg" noproxy>