... forward/fast back play 2,4,8,20; slow forward play 1/2,1/3,1/4,1/5,1/6,1/ ... music location, PCB function, play message display.GPS(Optional)Operation system:Windows CE6.0Built-in GPS navigation; external GPS is optionalSupport Garmin, Navteq,TOMTOM, IG08 ... Memory: 64MB SDRAMStoreage device:128MChipset:SiRF Star IIIFrequency:1.575GHZConsumption:4.5W(12V/360mA), Normal power consumption:3W(12V/250mA) ...