1)wifi, bluetooth,thermal printer 2)RS232,optional 1D scaner, rfid,camera,gprs 3) ... 1.1 Host,1 Client 1 RS232 serial portbuilt-in mic; Speaker and 3.5 mm stereo headphone jack ... x 93 x 37.5mmDurability Temp. in operation-10ºC + 45 ºC Temp. in storage-20ºC +55ºCHumidityDrop test5 ... /GPRS/3G ,WIFI,Bluetooth RS232 communication, and optional buit-in barcode scaner , rfid card reader and 37.9Khz infrared ...