Infant Optics DXR 8 Official Site
You can see some features and technical specification about Infant Optics DXR 8 in their manufacturer site. Useful features such as Extended Battery Life, dual USB chargers, Customer Service, Monitoring Network and etc.
http://infantoptics.com/dxr-8-baby-monitor/

Video Baby Monitor On Wikipedia
In Wikipedia Site , You can see standard technology (such as FHSS technology , wired and wireless system) and some features about Video Baby Monitor.
https://en.wikipedia.org/wiki/Baby_monitor#Video_baby_monitors_.28baby_cams.29