car amplifier RF-888B 1 RMS:50Wx4CH 2 Size:330x230x50mm 3 PCB single layer 4 terminal: Normal 5 Packing : Normal 6 heatsink red paint car amplifier: RF-1802A 1 RMS:35Wx2CH 2 Size:180x230x50mm 3 PCB: single layer 4 terminal: Normal 5 Packing : Normal 6 heatsink red paint car amplifier RF-1804A 1 RMS:35Wx4CH 2 Size:280x250x50mm 3 PCB: single layer 4 terminal: Normal 5 Packing : Normal 6 heatsink red paint