1.h 264 4 channel security equipment 2.BUILT-IN DDNS domain name 3.Digital zoom 4. ... at H.264 compressionUp to 4 channels CIF Real-time recording and 4 channels playback at the same timeSupply BUILT-IN ... workers at the same time support the operation of preview, recording, playback, network transmission, backup and mobile controlChinese, English, Thai, Russian ...