Commercial questions
 contacting
 delivery time
 loan sample
 payment options
 prices
 product life cycle management
 references Daheng Imaging
 return policy
 shipping costs
 VAT (tax free)
 warranty
Product selection
 applications
 interface (USB vs GigE)
 I/O (input / output)
 lens selection
 resolutions (image sensors)
 sensors (image sensors)
 shutters (global and rolling shutter)
Technical questions
 embedded (ARM board, Raspberry Pi)
 installation problems
 manuals (documentation)
 shock and vibration