1.4-ch 120fps dvr 2.PAL:400fps / NTSC:480fps 3.Support network, ... ,Iphone 4.Support PTZ,USB 5.Support 2TB HDD 4-ch 120fps dvr, with main features as below:High video quality ... searching, channel searching, information searchingStorageAndBackupHard disk capability for each channelAudio: 28.8Mbytes/hourVideo:25~450Mbytes/hourRecording storageHard disk, networkBackup modeNetwork, USBPortVideo ...