Because Techwell was primarily a semiconductor manufacturer (later acquired by Intersil), they often only provided the raw Software Development Kits (SDKs) to the actual card manufacturers. This means "official" drivers are rare, and you often have to rely on generic versions or original OEM software.
Specs:
The driver alone does nothing – you need software. Popular options: dvr card techwell tw6802b driver for win 7 64 bit hot
: The driver enables the chip to be recognized by Windows as a multimedia video controller or capture device. Driver & Compatibility Features dvr card techwell tw6802b driver for win 7 64 bit hot