There is no limit to the number of cameras you can use for your home. However, you are limited by how much bandwidth your router can handle.

Minimum bandwidth requirements by camera:

C1 Camera:

When working in 720p / 1Mbps / 30 fps Mode: 

Minimum bandwidth required for 720p HD live streaming: 1.024 Mbps

Minimum bandwidth required for successful motion & audio detection & clip upload: 1.333 Mbps

When working in 720p / 512kpbs / 15fps Mode:

Minimum bandwidth required for 720p HD live streaming: 512kbps

Minimum bandwidth required for successful motion & audio detection & clip upload: 1.024 Mbps

C2 Camera: 

When working in 1080p / 2Mbps / 30 fps Mode: 

Minimum bandwidth required for 1080p Full HD live streaming: 2.048 Mbps

Minimum bandwidth required for successful motion & audio detection & clip upload: 1.867 Mbps

When working in 1080p / 1Mpbs/ 15fps Mode:

Minimum bandwidth required for 720p HD live streaming: 1.024Mbps

Minimum bandwidth required for successful motion & audio detection & clip upload: 1.693 Mbps