... 2 USB2.0 3.Built-in web server 4.CE,FCC,ROHS... Features: 4 channel dvr(1). Compression Format: H.264 ... ports (3).Support GPRS/3G mobile real-time monitor (4).Language:Chinese,English,Japanese,Spanish, Germany,French,Italian,Russian,Poland ... -adaptiveCommunication InterfaceRS485x2(For PTZ and keyboard),USB2.0x2,ESATAx2PTZ ProtocalPelco D, Pelco P, RANGE, VISCA, DSCP, VIDO, STAR, NEON, MINKING, ...