... , bluetooth,thermal printer 2)RS232,optional 1D scaner, rfid,camera,gprs 3)4000battery SPECShandheld pda with thermal printerOSCPU ... Expandable 2G by expansion slotDisplayType sizetransflective TFT QVGA color; touch screen ,backlight3.5'',resolution 320x240 dpi ,sunlight viewableOperating Keys20 ... RS232 communication, and optional buit-in barcode scaner , rfid card reader and 37.9Khz infrared module