Yes, we will keep tightly contact when we cooperate.
Support technical advice as always when you need. No time limit. Also video advise of use and instruction is together with goods when shipping.
Actually, our products with very well 5 stars comments by our customers, when they use one year or even though 2 years passed.

For our hot items, we have stock, usually about 15days is ok. If special OEM/ODM design, we will be based on discussed.

Yes, we have more than 10years ODM/OEM service. We will discuss with our customers all details design according their requirements.

About 1-3days with our neutral package. It will be based on discussed if special design or requirement.

Normally, samples will be charged and shipping by freight collect. Special for some stock items, after discussed, samples will be free and freight cost paid before shipping.