Home Theatre Main Boards APEX-BT-6605 Prrtable USB,TF, MIC &FM Recording , FM Radio, MP3,Bluetooth.PCBA Circuit Booard with AUX support.PCB Size : 41*19mm,etc.(Customized sizes also available as per requirement) APEX-BT-66016-3203 Portable USB,TF MIC & FM Recording, FM Radio,MP3,Bluetooth.PCBA Circuit Board with AUX support .Inbuilt 2x Amplifier ICPCB Size :77 *20mmDisplay Size : 33* 08mm, 32 * 14 mm, 34 *16mm