Color Red + Silver Model T504 Quantity 1 Piece Material Aluminum alloy Shade Of Color Red Screen Size 2 inch Amplifier Class A Function MP3 PlayerRadio FM Frequency 87.5~108 fps Frequency Response Range 20~20K MHz Number of Channels 4 Rated Power 20 + 20+20 + 20 W Input Power 20 + 20+20 + 20 W Input Impedance 4~16 ohm Peak Power Output 100 W THD SNR 85dB Sensitivity 220MV 47K Remote Control Yes Power Supply 12 V Interface/Port USB 2.0SD card slotOthersAudio-in MP3 DC 12V power-in External Memory Max. Support 32 GB Application carmotorcyclegolf cartBoat Packing List 1 x Amplifier 1 x Remote controller (1 x CR2025) 1 x English user manual