The GXV3504 series offers an excellent solution for IP enabling of traditional analog cameras for professional surveillance environments. A next generation IP video server/encoder with powerful innovations, it packs a number of cutting edge technologies for best in class, flexibility and scaleability.» H.264 real time video compression (D1 resolution) with sharp image clarity at low-to-modest bandwidth» Industry leading SIP/VoIP for 2-way audio and video streaming to mobile phones and video phones» Embedded analytics amd large pre-/post-event recording buffer» Managed with GSurf, Grandstream"s intuitive video management software that controls up to 36 cameras simultaneously.Features & Benefits◦Advanced multi-streaming-rate real-time H.264, Motion JPEG at D1 resolution ◦24MB pre-/post-event recording buffer per port ◦USB 2.0 port and SD slot for storage/wireless network card ◦Embedded video analytics including motion (up to 16 target areas) & video loss detection ◦Built-in high performance streaming server to allow up to 12 simultaneous D1 viewers or 25 CIF viewers ◦Built-in high performance streaming server to allow up to 16 simultaneous D1 viewers or 25 CIF viewers ◦Combine with GSurf software to support remote viewing, controlling and recording of up to 36 cameras from anywhere on the Internet or corporate network.( GSurf Free Download) Feature SpecificationsChannels 4 Video Compression H.264 BP @Level 3.0, JPEG, Motion JPEG Max Video Resolution FullD1: 720 x 576 (PAL) 720 x 480 (NTSC) Max Frame Rate in Max Video Resolution 75fps/62.5fps (NTSC/PAL): 4 Ports at CIF at full rate, or 2 Ports at D1 & 2 Ports at CIF at full rate , or 4 ports at D1 at reduced rate Video Input 4 (BNC, voltage 1.0Vp-p, resistance 75?) Audio Input 4 (BNC), 3.5mm LINE-IN Audio Output 3.5mm LINE-OUT