Top-cofrLD 2.1 channels TPA3116 Hifi Class D Digital Amplifier Board 100W + 50W + 50W DC 19V-25V 3A above super bass 100w Left/Right channel output-- can drive 3-16ohm speaker when under 24v rated voltage Super low volume can drive 2-16ohm speaker when under 24v rated voltage 80Hz-500Hz frequency adjustable DC 19V-25V 3A above