it have two type version.
A type is USD25. B type is USD 35.
The more information can see the wiki website as below.
If you build in UVC driver in the Raspberry Pi , UVC webcam can work on it.
CVBS composite UVC grabber card is the same as uvc webcam.
because it follow standard UVC driver.
UVC CVBS composite video grabber card+ Raspberry Pi = WIFI video server
This picture show that CVBS backup camera connect with UVC grabber card.
The analog video signal is transfer to wifi video internet package.
Nexus 7 received it and display on APP.
The BOM cost is as below.
USD 35 Raspberry Pi Model B
USD xx Black case for RPi
USD xx 8GB SDHC memory card
USD 8 USB 802.11n 150Mbps Wifi
USD xx FEBON 100 UVC video grabber
USD 30 Backup camera
UVC CVBS grabber card+ Raspberry Pi is also equal the same as
UVC grabber card+ UVC WIFI AP ROUTER.