DROK® Micro Digital Amplifier Dual-Channel Two CH Amp 3W+3W Stereo Amplifier Board Module High Power Class D Amplifier Support 5V USB Power Supply;

Specifications:
Efficient digital amplifier chip, Built-in standby electronic switch, built-in high-gain buffer amplifier, built-in short circuit protection.
Input: DC 3.6v-5.5V (the chip will burn out if more than 5.5V.)
Output power: 3W +3 W (4 ohms)
Signal to Noise Ratio: 90dB
Efficiency:> 90%
Maximum closed-loop gain:24DB

Notice:
positive and negative power supply can not be reversed, the supply voltage can not exceed 5.5V, or it would burn out the IC.
On-chip high-gain buffer, can not change any component. Improper parameters would lead to IC damage.
Please try to use the input line with shield wire, to removing clutter and current sound.
CMOS BTL Driver Output, Left and right negative of speakers can not be connected together, 4 speaker wire is completely independent, Not allow connect together.

if use with computer, powered by the computer USB, that would caused current sound. because the audio and USB common ground, so the current sound is unavoidable.

Package Includes:
1x Mini Amplifier
4x Cable