... : WEB & Windows based software3.2.VideoVideo Input:1/2/4 Channel, 1.0Vp-p, 75ΩVideo Standards: PAL625Line,50f/s ... 3.AudioAudio Input: 1/2/4 channelAudio Output: 1 channelAudio CompressionADPCMConnector: RCA3.4.Alarm 1/2/4 channel bi-directionalConnector: Terminal Block ... due to Fibridges policy of continuous product improvement** 4 channel Digital Video Server,Network Video Server,Digital Video Server