Kindly notice:
1sata 3.5inch 320GB-4TB hard drive (Not included) is needed for the system to record video. And you also need a monitor and a VGA/HDMI cable to hook up with the monitor.

NVR Specification: 

Operating System: Embedded linux OS.
Video resolution: 4ch 1080P(1920 × 1080) HD NVR with built-in Router
VGA & HDMI outputs up to 1080P.
Supporting 4 channel sync-playback, video recording, Video detection recording, video loss alarm and schedule recording.
Power: DC 12V2A
Consumption(excluding HDD)

Product Features

• Superior Night Vision: 4CH high resolution 1920×1080 and 3pcs array led which will automatically activate when the camera detects lower light condition enable night vision range up to almost 65ft (20m) for excellent video quality and clarity in the day and night.
• NVR built in router and two wifi antennas, so the wireless range can cover 1500ft in open area, up to 250ft with obstacles (Between one wall and three walls) and sometimes wifi signal might be affected because of the obstacle and you can move the camera antenna to adjust it into right spot.
• Easy monitor displayer view (Power on the nvr and wifi camera & ethernet cable connect between nvr WAN port and router Lan port & hook HDMI or VGA cable into monitor port, the video will show up.), PC client monitor view(Download software on the PC and then search device and start viewing) and remote phone app view anywhere, anytime (download IP PRO app from Android Google Play or Apple APP Store to add Cloud ID and monitor on the phone APP. Or search: www.dvr163.com to view on the web browser.
• Receive email alerts upon motion detection or app alert when set it up (Notice here please set it up properly to avoid email blast) & System aupports synch-playback, video backup and video detection & supports 1 sata port & max video storage 4TB & 1 USB 2.0 port for operation of mouse control.
• Kindly notice: this system is without HDD in this box and also wireless system here means there is no need to use ethernet cable for each camera but power supply is needed for supplying power to cameras and NVR and also NVR should be hook up into router with ethernet cable. Besides if its necessary when you first power on the camera and NVR there is no video showing on the monitor you can connect them with ethernet cable to match code as a result of wireless using.