1967-73 Custom Autosound 740. The USA-740 offers the same classic look that Custom Autosound has always been known for with today's latest features. Now, with built-in mobile wireless connectivity (microphone included), answer calls and get wireless streaming music from your mobile wireless capable phone or compatible device. A solid 300-watt peak power should be all the juice you need, yet the USA-740 has Hi 4volt, 4-channel Rca Pre-outs and a Subwoofer Rca pre-out for additional amplifiers.