REVO has quickly established itself in the retail market as the upper echelon of video surveillance equipment, With over 30 years of combined experience in video surveillance product manufacturing, management and support, REVO offers the highest quality in video surveillance equipment, 4CH DVR 120IPS 500GB HDDREVO’s 4th generation of professional DVR’s continue to deliver commercial grade type features at affordable prices, EZLink, Push notifications to most smartphones, as well as full DVR access using your smartphone to control PTZ cameras, search recorded video and monitor audio while you’re on the go, via REVO Mobile, a free app, are just a few of the features of this powerful, professional DVR, , Security Digital Video Recorder Features:, Video inputs: 4 Channels with RJ12, Video outputs: 1 RCA and 1 VGA, Recording rate: 240 ips (NTSC) guaranteed, Playback rate: 240 ips (NTSC), Advanced Scheduling; Pre-Event and Post-Event recording (up to 2min ea, ), , 3 recording modes, 5 search modes, 500GB hard drive included (expandable up to 3TB), Connection: 10/100 ethernet, Protocols: Manual, ADSL, DHCP, DVRNS, Remote access included, Max transmission rate: 120/100 ips @ CIF (NTSC/PAL), Audio in/out: 8 (RJ-12)/1 (RCA), Alarm in/out/reset in: 8 channels - 8/1/0, 2 USB 2, 0 ports, Main out: 1 RCA, VGA out: 1 RGB, RS485 port: 1 half duplex, IR remote control port, Digital Video Recorder, 500GB Hard Drive, 2 Power Cords (DVR and System), USB Mouse, Infrared Remote Control and Batteries, User"s Manual, Dimension(L x W x H): 22 x 20 x 7 in SKU: REAM016