1.7 inch all in one industrial computer 2.533MHz CPU,2G Flash Rom, RS232x2 3.RS485x2,USB,SD Card slot 4.DC9 ... 485 x 2, Earphone Jack x 1, SD Card slot x 1.5.Built in WIFI, Bluetooth ,Rechargeable Battery (Optional ).6. 9 ... .13MINI USB interface1RS232 port2RS485 port2Audio output earphone block1Bluetoothbuilt-in(optional)WIFIbuilt-in(optional)SD Card slot1(Max to 4GB) Accessories: Touch pen x ...