Installation Video for DIY surveillance camera system: https://youtu.be/jzGBAmz2ERI

HDD
A hard disk drive (HDD), hard disk, hard drive or fixed disk is a data storage device used for storing and retrieving digital information.
There is no hard drive pre-installed in the kits. It means the NVR kits cannot save video or photos, but you still can do real-time monitoring through mobile or computer.
You could purchase Internal HDD (Max supported HDD storage is 3TB) according to your requirement.

Overview
This wireless video surveillance systems is your reliable security guard which can be used at residence or business, wireless WIFI unhindered transmit over 80M (262 Feet), partition transmit 30M (98 Feet), stable and reliable, including a professional level NVR(Network Video Recorder) featuring 4 channels of real-time record and playback, DIY installation, night vision, Smartphone viewing.

Wireless Ip Surveillance Camera
✔Resolution: HD 1280 *720P Metal Bullet Camera
✔Image Sensor: 1/3″ Super low illumination 1.3 Megapixel image sensor
✔Night Vision: IR-Cut Filter up to 100 feet (30m)
✔Built in 3.6mm Lens for wide 45 degrees views angle
✔Waterproof IP66
✔Idea for Home and Business Security, indoor/ outdoor Use

Wireless Wi-Fi NVR
✔4CH 960H 2.4G Wireless WI-FI Network video recorder
✔Support video preview/recording/playback/ USB backup /Alarm/Motion Detection/Timing
✔Support the mixed use of wireless and wire, support difference scene
✔Support VGA & H-DMI, LAN Connection,2 USB port for operation of mouse control, back up, upgrade
✔Plug and Play, Quick QR Code Access

Package Includes
1× 4CH 960H WIFI NVR,NO HDD Included
4× 720P HD WIFI IP cameres
4× 9.8 Feet Power Supply(12V-2A)for Bullet Cameras
1× Power Supply(12V-2A)for NVR
1× USB Mouse
1× 1M Network cable

Product Features

• ✔Premium HD 720P Video Cameras: getting into more details with stuning high definition picture or video; IP66 indoor/ outdoor heavy duty metal waterproof cameras perfect for home security or outdoor use.
• ✔Easy to Set Up: DO it Yourself, No need Wires Anymore, No Exposed Lines Anymore, More Beautiful, More Hidden, More Safe. Download the App, plug in Your Camera and Connect to Your Local/ Home Wi-Fi Network.
• ✔Remote viewing for Video Security System: 2.4G wireless Wi-Fi video transmission, support various Cell phone monitoring（IOS, Android）and tablet PC remote viewing anytime anywhere
• ✔Night vision and Motion Detector: wireless Nvr security camera system provides day and night surveillance with night vision capability and NVR monitor motion detect, with IR-CUT double filter lens allows to see very clear images in the darkness up to 100Ft
• ✔Please note HDD is not pre-installed.1 Year Warranty and Free Life Time Tech Support From Hi-Tech.