Sound Amplifier pam8403 Module - Stereo - 3W, 4 ohm - 90 dB

Color : red Material : circuit board Voltage : DC 2.5 - 5.5V Output power : 3W + 3W (at 4 ohm) Noise Ratio : 90 dB Efficiency : more than 90% 2 channels 3W amplifier Output is CMOS BTL driver cannot change any component parameters to protect IC Board ca also powered by 5v USB power supply or 4 x 1.5V batteries Dimension : 2.3cm * 1.6 cm * 0.2cm Weight : 7g