Before product design, it is important to form a PRD to guide and standardize product design.

Each country has its own product laws and regulations, and people's usage habits are also different. we need to consider all things before design.

Who uses it, how to use it, and under what environment, we need to think about them and write them in PRD from the perspectives of practicality, reliability, and safety.

Cost is also important and must be considered before design. On the premise of meeting product requirements, we need to think about material, production processes, assembly methods to minimize reduce the cost.