US teams commissioning hardware prototypes should separate one-time engineering from physical sample costs. A PCBA is a circuit board with its components assembled; it does not automatically include an enclosure, wiring, firmware configuration or complete-unit testing. A quote should identify each deliverable, quantity and acceptance condition.
Beijing Winge Technology Co., Ltd. operates as Winge and provides electronics and prototype engineering services. The following is a suggested method for requesting and reconciling quotes; scope, rights, prices and schedules are agreed in project documents.
Define prototype purpose and delivery units
Provide functional and interface requirements, power and mechanical constraints, existing schematics and PCB projects, the bill of materials (BOM), and firmware status. Identify reusable designs, rights to the files and customer-supplied materials.
List bare-board, PCBA, complete-unit and spare quantities separately. State whether samples serve functional validation, fit checks or demonstrations, and agree checks, environments and pass criteria for each deliverable.
Six cost categories and delivery boundaries
Use this table to identify what each charge covers. Classification is agreed in the quote; this is not a price list.
| Cost category | Pricing inputs | Delivery and acceptance boundary |
|---|---|---|
| One-time engineering | New or revised circuitry, PCB, firmware and mechanical work | Design files, revisions and usage rights; physical samples are not included by default |
| PCBA batch | Board quantity, fabrication specification, BOM, assembly and supplied materials | Track assembly, power-up and agreed board functions by board identifier |
| Mechanical parts and wiring | Drawings, materials, processes, part and harness quantities | Check dimensions, interfaces and fit; confirm tooling separately |
| Unit assembly and configuration | Complete-unit quantity, assembly steps, firmware and configuration revisions | Map unit identifiers to boards, mechanical parts and configuration lists |
| Debugging and testing | Cases, equipment, limits, retest scope and responsible parties | Preserve conditions, actual results, issues and untested items |
| External costs | Licenses, external laboratories, shipping, taxes and other charges | Confirm inclusion, supplier, supporting records and settlement terms |
Reconcile quotes and acceptance against one revision
Before comparing totals, check whether a charge is already included elsewhere. Do not add the BOM cost again to a PCBA batch that includes materials. Keep one-time engineering distinct from per-unit sample prices, with any allocation explained.
An initial package can cover a file inventory, scope and supply-responsibility table, quotation assumptions and draft acceptance cases. Deliver a gap list and subsequent work packages, with separate design, board and complete-unit milestones.
Link design files, BOM, firmware, assembly lists and test records to one revision. Acceptance records identify the unit, inputs, environment, limits, actual outputs and issues. Passing board tests does not establish that the complete unit passes.
Remote handover inputs for US teams
For work across time zones, agree the working language, meeting time zone, file formats, sample shipping locations and each team's test equipment. Remote retests need traceable samples, wiring and configurations; a demonstration video alone does not establish full acceptance.
Confirm quotation currency, validity, payment, shipping, taxes and compliance work separately. The US is the intended audience; it does not establish fixed tax rates, certification requirements or a local service team.
Common questions
Does the development fee include physical prototypes?
Not necessarily. Specify quantities and included procurement, fabrication, assembly and testing separately, and distinguish the design-file deliverables from the physical samples.
Does a tested PCBA qualify as a complete prototype?
Not by itself. Check mechanical parts, wiring, power, firmware configuration and complete-unit functions against conditions and pass criteria agreed in advance.
Does ordering more samples require another development fee?
First check whether the design and configuration can be reused. Price repeat manufacturing, assembly and per-unit verification by added quantity. List design changes, substitute-part validation and new features separately; do not assume everything is charged again or provided free.
Related services and inquiries
Hardware development (Chinese), PCBA services (Chinese) and product prototype development (Chinese) describe engineering scope available for discussion.
The company profile (Chinese) identifies the company and its project-based delivery approach.
Use the project inquiry form (Chinese) to provide existing design files, board and complete-unit quantities, supply responsibilities and proposed acceptance cases, so the first-stage scope can be defined.
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