... channels,8 channels,16 channels. 1080P*4CH HD-SDI 4CH DVR CE, UL listed HD-3104DVideo Input ... /Output: BNC 4CH In / 1CH Out, VGA 1CH Out, HDMI 1CH OutAudio Input/Output: RCA 4CH ... In/ 1CH OutAlarm Input/Output: Alarm 4CH In/ 1CH OutCompression Method ... H): 405mm×325mm×65mm, weight: 6.0kg 1080P*4CH, RS422, PTZ, Alarm, Network, 2 SATA HD ...