Boss 660CK Package System (Boss 638UA In-Dash CD/MP3 Reciever plus one pair of Boss Duo-Fit speakers that may be used to replace existing 5.25" or 6.5" speakers) 240-watt receiver/speaker package system pairs Boss 638UA receiver with pair of duo-fit speakers Speakers will fit both 5.25-inch and 6.5-inch installs AM/FM radio, CD, CD-R/RW, MP3 receiver with 4 x 60 Watts maximum power Active black mask display with illuminated control buttons and quartz digital clock Includes front panel auxiliary input, USB port, SD card slot, wireless remote