Built for Buyers Who Value Stability Over Short-Term Price
Merryking was founded with a clear focus: manufacturing reliable AC/DC power adapters for B2B customers who require long-term stability, regulatory compliance, and consistent mass production.
In an industry where many suppliers compete on price alone, we chose a different path. Early on, we realized that for OEMs, equipment manufacturers, and distributors, the real cost is not the unit price — it is the risk hidden behind unstable quality, inconsistent batches, and unusable certifications.
That understanding shaped how we built our factory, our quality system, and our way of working with customers. Today, Merryking is not just a power adapter supplier, but a manufacturing partner designed to reduce procurement risk and support long-term growth.
Ready to work with a stable manufacturing partner?
Discuss Your ProjectA Source Factory Focused on B2B Manufacturing
Direct manufacturing capabilities for global markets requiring scale, consistency, and compliance
Merryking is a direct-source power adapter manufacturer based in China, specializing in wall plug power adapters, desktop power supplies, and interchangeable plug adapters for global B2B markets. Our customers include brand owners, equipment manufacturers, system integrators, and distributors across North America, Europe, and Asia-Pacific.
Rather than chasing one-off orders, our production system is built around repeat orders, scalable capacity, and stable output — making us a reliable long-term supplier rather than a short-term vendor.
No middlemen. Direct access to production lines, engineering team, and quality control systems.
Standardized production processes ensure every batch meets the same quality specifications.
Certified products with UL, CE, FCC, CB, UKCA and other market-specific certifications.
Interested in partnering with a reliable source factory?
Request Factory DocumentationDesigned for Professional B2B Buyers
We work with customers who understand that stable supply relationships create more value than the lowest unit price
Certified Products Required
Your customers or regulations require power adapters with valid certifications for resale or integration into equipment.
Batch Consistency Matters
You need consistent quality across repeat orders—not just the first sample batch that arrives perfect.
OEM / ODM Support Needed
You require customization that is technically feasible and can be mass-produced reliably at scale.
Direct Factory Preferred
You prefer working directly with the manufacturer rather than through trading companies or middlemen.
Typical Customer Roles We Work With
Does this sound like your purchasing situation?
Start a ConversationA Real Factory, Not a Virtual Operation
Direct manufacturing capabilities you can verify
Merryking operates its own production lines, QC processes, and warehousing facilities. From incoming material inspection to final shipment, every step is handled internally. This isn't a shell company coordinating with external workshops—it's a genuine manufacturing operation where decisions happen inside the factory, not over WeChat with third parties.
In-House Production Lines
Multiple assembly lines with dedicated staff operating under direct management—no outsourced production to unknown workshops.
Internal QC System
Quality inspectors report to our QC manager, not external third parties. Testing equipment and protocols are standardized factory-wide.
Owned Warehousing
Raw materials and finished goods stored on-premise, allowing better inventory control and faster order fulfillment.
Transparency Is Not a Marketing Concept—It's a Practical Requirement
We encourage customers to verify our factory through videos, documentation, or on-site inspections. For B2B buyers managing supply chains, knowing exactly who manufactures your products reduces risk and simplifies quality accountability. If you're tired of vague answers about "our partner factory," we offer a straightforward alternative.
Want to verify our factory capabilities?
Request Factory Video or VisitCertifications That Support Real Market Access
Compliance documentation that helps you sell legally in regulated markets
More Than Paperwork: How Certifications Actually Work in B2B Projects
Reusable Certs
Standard models with existing certifications ready for immediate use in your projects.
Project-Specific Certs
Custom certifications for your unique specifications—we handle the testing and filing process.
Market Access Guidance
We help you understand which certifications are required for your target markets.
Certification to Market: How It Supports Your Sales
Certification Obtained
Product tested and certified to relevant standards for your target market
Legal Market Entry
Compliance documentation enables you to sell or integrate products legally
Customer Confidence
Your customers gain assurance that products meet regulatory requirements
Need help understanding certification requirements for your project?
Discuss Certification NeedsCustomization That Can Be Mass-Produced
Practical OEM/ODM capabilities built for scalable manufacturing, not just samples
We support customization across key functional and structural elements—but not arbitrary requests that create manufacturing complexity without real value. Our approach balances flexibility with production reliability, ensuring that customized units maintain the same quality standards as standard models across repeat orders.
Plug Configuration
Select from global plug types (US, EU, UK, AU, etc.) or use interchangeable plug designs for multi-market products.
Cable & Connector
Specify cable length, gauge, and DC connector type (barrel, USB-C, specialized connectors) to match your equipment.
Housing & Color
Choose housing materials (ABS, PC) and custom colors for brand consistency or product line differentiation.
Branding & Labels
Add your logo, regulatory labels, and safety markings using pad printing, laser engraving, or custom label printing.
Customization Capability Matrix: From Sample to Mass Production
Sample Stage
Validate your specifications before committing to production tooling or larger orders.
Pilot Run
Small batch to verify production processes and quality consistency before scaling up.
Mass Production
Full-scale manufacturing with consistent quality across batches for ongoing supply needs.
Customization is not about making anything imaginable—it's about identifying the specific modifications that add real value to your product while maintaining manufacturability at scale. We focus on practical customization that can be reliably reproduced across thousands of units.
Have a customization requirement in mind?
Discuss Your SpecificationsConsistency Is Engineered, Not Assumed
Systematic quality control at every production stage to prevent defects before shipment
Our quality control system covers the entire production lifecycle—from incoming materials to final shipment. This isn't about inspecting products after problems occur; it's about designing quality into each stage of manufacturing to ensure consistent output across all batches.
Quality Control Lifecycle: Four Critical Checkpoints
Incoming QC
IQCRaw materials and components inspected before entering production to prevent defective inputs.
In-Process QC
IPQCProduction line inspections to catch issues during assembly before they compound into larger problems.
Final QC
FQCCompleted units tested for electrical performance, safety compliance, and cosmetic standards.
Outgoing QC
OQCPre-shipment inspection of packaged goods to verify correct quantities, labeling, and shipping readiness.
Testing Equipment & Procedures
Electrical Testing
Voltage accuracy, current output, ripple noise, and efficiency measurements under load conditions.
Safety Testing
High-pot testing, insulation resistance, grounding continuity to meet UL/CE/FCC safety standards.
Aging Test
Units run under full load for extended periods to identify early failures before reaching customers.
Risk Mitigation at Each Stage
Component Traceability
Batch tracking for critical components prevents counterfeit or substandard materials.
Process Documentation
Standard Operating Procedures (SOPs) ensure consistency regardless of operator or shift.
Sampling Plans
Statistical sampling based on AQL standards balances inspection rigor with production efficiency.
Non-Conformance Handling
Failed units isolated, analyzed, and used to trigger corrective actions to prevent recurrence.
Want to understand our quality processes in detail?
Request QC DocumentationA Transparent, Step-by-Step Cooperation Process
Clear expectations at every stage from initial inquiry to ongoing reorders
Our standard cooperation process includes six clear steps designed to minimize surprises and align expectations. Each stage addresses specific buyer concerns—from specification validation to payment terms—ensuring both parties understand commitments before moving forward.
Inquiry & Requirements
Share your specifications, target market, and quantity needs.
Buyer Concern: "Will they understand my requirements?"
Quotation & Technical Review
Receive pricing, lead times, and technical feasibility assessment.
Buyer Concern: "Is this technically possible?"
Sample Confirmation
Physical samples sent for your testing and approval before production.
Buyer Concern: "Will production match the sample?"
Order Placement
Formal PO, payment terms agreed, and production scheduled.
Buyer Concern: "What are the payment terms?"
Production & QC
Manufacturing with regular updates and pre-shipment inspection.
Buyer Concern: "How do I track progress?"
Shipment & Reorder
Delivery arranged, documentation provided, reorder process simplified.
Buyer Concern: "What about repeat orders?"
What Makes Our Process Different
Written Specifications
All technical requirements documented before production starts—no reliance on verbal agreements or assumptions.
Pre-Production Approvals
You approve samples before mass production begins, reducing risk of specification mismatches or quality surprises.
Progress Communication
Regular production updates so you can plan your downstream activities—no need to chase us for status reports.
Ready to start the cooperation process?
Submit Your First InquiryFrom Trial Orders to Scalable Supply
How small initial orders evolve into strategic supply partnerships
Many of our long-term partners started with small trial orders to validate quality and cooperation before scaling up. This approach reduces risk for both parties—you test our reliability with manageable quantities, while we demonstrate our ability to meet your standards consistently across repeat orders.
Growth Pathway: How Relationships Develop
Trial Order
Small initial order to validate quality, lead times, and communication before committing to larger volumes.
Repeat Orders
Regular reorders as confidence builds, with optimized processes and improved pricing based on volume.
Scale & Partnership
Strategic partnership with forecasting, inventory planning, and dedicated support for growing supply needs.
Benefits of Long-Term Cooperation
Better Pricing
Volume-based discounts and optimized production costs passed to reliable long-term customers.
Faster Lead Times
Priority scheduling and pre-allocated production capacity for partners with predictable order patterns.
Dedicated Support
Assigned account manager who understands your business and can proactively address potential issues.
Quality Stability
Deep familiarity with your specifications reduces variation and improves consistency across batches.
MOQ Flexibility Across Order Stages
units minimum to validate quality and fit
units for standard production efficiency
units quarterly for volume pricing tiers
Ready to start with a trial order?
Discuss Your First OrderSupporting Different Business Models
Flexible partnership structures designed for various B2B scenarios
We work with partners under various cooperation models—from brand owners requiring full OEM customization to distributors seeking ready-to-sell certified products. Our approach adapts to your business structure while maintaining consistent quality and supply reliability.
Three Primary Cooperation Models
Original Equipment Manufacturer
Full customization under your brand—from specifications to packaging—manufactured to your exact requirements.
Original Design Manufacturer
Select from our existing designs with your branding—faster to market with proven reliability and existing certifications.
Wholesale Distribution
Purchase certified products under the Merryking brand for resale—ready inventory with full compliance documentation.
Trusted by B2B Partners Globally
Representative partners across equipment manufacturing, distribution, and system integration sectors
Industries We Serve
Interested in exploring a partnership model?
Discuss Cooperation OptionsWhat Long-Term Partners Say About Working With Us
Direct feedback from buyers who prioritize supply stability and quality consistency
"We've worked with multiple suppliers over the years, but Merryking stands out for batch consistency. Every order matches the approved sample—no surprises when shipments arrive. This reliability matters when you're building medical devices where component failure isn't acceptable."
"What impressed us most was their transparency about certifications. They didn't just send certificates—they explained which standards applied to our target markets and helped us understand testing requirements. This saved us weeks of back-and-forth with regulatory consultants."
"As a distributor, we need suppliers who understand urgency without compromising quality. Merryking delivers on both—they maintain production schedules even during peak seasons, and their QC process catches issues before products ship. That's rare in this industry."
Partnership Performance Metrics
Join our network of long-term partners?
Start Building a PartnershipLet's Discuss Long-Term Cooperation
Whether you need a quotation, technical consultation, or want to schedule a factory visit, we're ready to talk
Merryking Factory Location
Guangdong Province, China
Manufacturing Hub with Direct Access to Major Ports
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