【Expandable】 This system includes 1x 8-channel 1080P (1920x1080) NVR and 4 x 960P (1280 X 960) wireless IP66 waterproof Cameras. It is ideal for both indoor and outdoor uses, perfect for villas, homes, offices, workshops, warehouses, restaurants and etc. This expandable system can support up to 8 cameras. Additional cameras may be purchased on Amazon (ASIN:B01M7ZBJKB). OOSSXX is NOT responsible for installation. 【Wireless】 Please note the system is NOT battery operated. Both NVR and cameras need to be plugged into nearby power outlets. Within the system, NVR and cameras communicate automatically and wirelessly. This is a robust wireless system, however, under certain circumstances, due to factors such as distance and obstacles etc, the system wireless signals may not be strong enough to support live monitoring, then a special Wi-Fi extender (ASIN:B079CGXCR2) is recommended to extend greater wireless. 【Snapshot Email Alert】 The system supports motion detection records and e-mail snapshot alerts etc. Detailed schedules for each camera can be selected to customize your own detection plan. For example, when a motion is detected, a picture will be taken and sent to e-mail automatically or an alert will be sent to your phone. Hard drive MAX 6TB support.