For buyers who have never commissioned a custom product, the design process can feel opaque. How does an idea for a branded power bank or a custom TWS earbud become a real, manufactured product? A professional OEM/ODM programme follows a structured path, and understanding that path helps buyers participate effectively, plan timelines and set realistic expectations.
Zishine works with clients in Indonesia, Japan, the United States and global markets on magnetic power banks, TWS earbuds and Type-C rechargeable batteries. Below we explain the standard design and development workflow, from the first requirement review through industrial and mechanical design, prototyping, tooling, validation and finally mass production.
Q: What happens at the first requirement review stage?
The first stage is about aligning on what the product actually is. Zishine's account and engineering team sits down with the buyer to clarify the product category, target market, key features, capacity or performance goals, certification requirements, packaging needs and the expected order quantity and timeline. This is where the buyer shares its vision, and the engineers flag what is technically feasible, what adds cost and what needs extra development time. The output is a clear project brief and a specification sheet that both sides agree on, so everyone is building the same product. Getting this foundation right prevents costly changes later, because a design is far cheaper to alter on paper than after tooling is cut.
Q: What are industrial design and mechanical design?
Industrial design, or ID, is the outward appearance: the shape, materials, colours, surface finish, branding placement and overall look and feel of the product. It defines what customers see and touch. Mechanical design, or MD, is the internal engineering: how the PCB sits inside the housing, how the cells fit, where the magnets and ports go, how the parts assemble, and how the structure holds up under drop and stress. The two work together: a beautiful design that cannot be assembled or that interferes with the electronics has to be revised. Zishine's ID and MD teams collaborate from early on, so the product looks good and works as a tightly engineered unit rather than an appearance shell forced onto internals.
Q: What is a prototype or hand sample, and why is it needed?
A prototype, or hand sample, is a physical model made before tooling, usually using 3D printing or CNC machining to test the shape, fit and appearance. It lets the buyer hold the product, check the size and ergonomics, see the colours and materials, and confirm the look before any expensive mould is cut. This is the cheapest stage to make changes, because altering a 3D-printed part takes days, while altering a steel mould after it is cut is expensive and time-consuming. Buyers should expect to review one or more prototype rounds, give feedback, and approve the design before moving to tooling. This review step is where most design decisions get locked in.
Q: What is tooling, and when does it happen?
Tooling is the creation of the production moulds, usually steel moulds for plastic injection parts, that will mass-produce the custom housing. Tooling only starts after the design is fully approved, because once a mould is cut, changing the shape requires reworking or replacing it, which is costly and slow. This is why the design review and prototype stage matter so much: every detail the buyer wants should be settled before the mould is cut. Tooling itself takes time and is a significant investment, which is why it is tied to minimum order quantities. Once the mould is ready, it can produce consistent parts for the entire production run and future repeat orders.
Q: How is the design validated before mass production?
After tooling, the first parts come off the mould and undergo validation. The team checks that the parts assemble correctly, that the electronics fit and function, that the appearance matches the approved prototype, and that the product passes safety and reliability tests. This may include drop tests, charging-discharging verification, temperature checks and, where required, the certification testing for the target market. The buyer also reviews a pre-production sample, often called a golden sample, and signs off on it. This validated sample becomes the reference standard that all mass production is measured against. Validation catches any issues introduced during the move from prototype to real production before the full order is built.
Q: How long does the whole design process take?
The timeline depends on how custom the product is. A private-label project using an existing platform, where only the logo, colour and packaging change, can move much faster than a fully ODM product with a brand-new housing, new electronics and new tooling. Requirement review and design work take time in the early phase, prototyping adds review cycles, tooling is the longest single stage, and validation and certification add further time. Zishine maps out a stage-by-stage schedule during project planning, so the buyer knows when to expect samples, when tooling completes, and when mass production can ship. Urgent launches should be flagged early, because expediting tooling and testing is always possible but costs more.
Q: Who owns the design and tooling once it is developed?
Ownership of the design and tooling is agreed contractually during project planning. In many ODM arrangements, the tooling is paid for by the buyer and held by the factory for production use, while the design rights and exclusivity can be negotiated. If a buyer wants exclusive rights to a design or wants the tooling shipped after the programme ends, that is arranged in the agreement. Zishine supports this with confidentiality agreements so the buyer's brand and custom design are protected. Clarifying ownership early avoids later disputes about who can use the design, and it is part of setting up a long-term OEM partnership on fair terms.
Q: What can the buyer change at each stage of the process?
Changes are cheapest and easiest in the early stages. During requirement review and design work, changes to shape, colour, features and layout are quick. During prototyping, appearance and ergonomic changes are still manageable. Once tooling begins, structural changes become expensive, and after the mould is cut, major redesign means reworking or replacing the mould. During validation and mass production, only minor adjustments are practical. This is why Zishine encourages thorough review at the prototype stage and gives buyers ample opportunity to request changes before tooling. The buyer's best strategy is to review carefully early, because each stage locks in more of the design.
Q: How does Zishine support the buyer through the design process?
Zishine combines the Shenzhen R&D centre, where engineers do the ID, MD and electronics development, with the Xiangyang production base, where tooling and mass production happen. This means the buyer works with one partner that covers design, prototyping, tooling, validation and production, rather than coordinating separate design houses and factories. The account team manages the schedule, shares samples at each milestone, and flags risks early. With 15-plus years of lithium battery experience and certifications including CE, UL, PSE and UN38.3, Zishine guides buyers through design decisions that balance appearance, cost, certification and manufacturability, turning a concept into a product that can be built reliably and sold confidently.
Q: What should a buyer prepare before starting the design process?
To make the design process smooth, the buyer should come with a clear sense of the target market, the key features, the price band, any required certifications, branding assets and packaging ideas. Reference products, sketch or mood boards, and a sense of the desired order quantity all help the engineers. The more specific the buyer is about the use case and the market, the faster the requirement review converges. Zishine then turns that input into a structured spec, a timeline and a proposal. For a detailed checklist of the materials and files to prepare, the next FAQ covers exactly what to gather before a custom project begins.
