4-Channel WiFi Kit including 4-Channel NVR with Embedded Wi-Fi Module & 4 2MP Vandle Domes.
In an open wide environment: the max distance for the Wi-Fi dome is 850 ft (260m).
Through the wall (1ft thick reinforced concrete wall): the max distance for the Wi-Fi dome is 65ft (20m).
NOTE: The ability to pass through the wall is closely related to the wall, and the wall may be different, so the data is for your reference only.
Cameras require a power outlet for each camera
Refunds not available for this product after installation. 
Using the EZView app will allow you to view your cameras, get alerts if the camera sees something, or playback video all on the go.
Note that power cable for cameras are around 3M. If your power source for each camera is farther away it is recoma ended to splice cable and extend using 22/2 cable or move the camera closer to power source.