opt for more amps
if you are using for a high powered audio unit, you might want to opt for the 7 or 10 amp unit. i do not crank my audio unit which i bought for entertainment around my spa and pool area. so 3 amps is just right. easy to use. just neg. and poss. connnections. when using with head unit, all necesary power connections to poss. trminal. just one neg. connection ... blk/grd. compact unit. good length of power cord. heat dissipation is good with strategic placement of cooling fins and vents.
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