DROK Super Small 3W+3W DC 5V Audio Amplifier Handy Digital Power Amp Module Board Dual-channel PAM8403 Stereo Amplifiers with Potentiometer for DIY portable Super small Size (302216mm, NOT included the handle of the potentiometer ), light weight, handy and easy to install Flexible power supply: the module can easily run off three AA batteries, a USB Cell phone charger, a rechargeable Cell phone charge pack Top notch potentiometer, easy and smooth to adjust the volume and control the power switch Crisp and Clear sound output, low noise, give you best hearing enjoyment Please note that do NOT connect to power if you do have the speaker connected, or will wreck the module