Your trusted one-stop sourcing partner. 10+ years of excellence in global trade across 5 core categories.
Shenzhen Calculus Boundless Technology Co., Ltd. (CBT) is a leading global trading company headquartered in Shenzhen, China — the world's manufacturing hub. With over 10 years of industry experience, we specialize in one-stop sourcing solutions across five core categories: 3C consumer electronics, auto parts, hardware tools, daily necessities, and fashion apparel.
We maintain long-term partnerships with hundreds of verified factories across China, enabling us to offer competitive pricing, consistent quality, and reliable supply. We serve more than 500 clients across 50+ countries, including brands, distributors, e-commerce sellers, and promotional gift companies.
We are committed to delivering high-quality products, competitive pricing, and exceptional service to help our clients succeed in their markets.
Years of Experience
Verified Factories
Product Categories
Countries Served
From concept to delivery, we provide comprehensive OEM/ODM services to bring your product vision to life.
Industrial design, ID design, and structural design services. Our experienced R&D team can develop products from scratch based on your specifications and market requirements.
Custom branding with your logo on products, packaging, and user manuals. Multiple logo options: silk printing, laser engraving, UV printing, and more.
Tailored packaging solutions including color boxes, blister packs, gift boxes, and retail packaging. Full customization of materials, design, and size.
Adjust product specifications to meet your market needs: capacity, power output, colors, materials, functions, and accessories can all be customized.
Assist with regional certifications: CE, FCC, RoHS, PSE, KC, UL, and more. We help ensure your products meet local market regulatory requirements.
7-15 day sample turnaround for OEM projects. Rapid prototyping capabilities to accelerate your product development cycle and time-to-market.
Rigorous quality control at every stage ensures every product meets our high standards before reaching your customers.
100% inspection of all raw materials and components before production
In-process quality checks at each production stage by line inspectors
4-24 hour aging tests for all electronic products to ensure reliability
Comprehensive function and appearance inspection before packaging
Outgoing quality audit with AQL standard sampling before shipment
We go beyond manufacturing — we build lasting partnerships focused on your success.
Direct factory pricing with no middlemen. Scale economies enable us to offer the best value without compromising quality.
On-time delivery rate over 98%. Efficient production planning and supply chain management ensure your orders arrive when promised.
12-month warranty on all products. Comprehensive after-sales support with replacement and repair services for defective units.
Each client gets a dedicated account manager. Professional sales team with quick response times and multilingual communication support.
Our mission is to be the most reliable one-stop sourcing partner for businesses worldwide. We achieve this through verified supplier networks, strict quality control, and unwavering commitment to customer success.
We envision a future where every business — regardless of size — has access to premium quality products at competitive prices, helping them compete and thrive in the global market.
Let's discuss how CBT can help grow your business with quality 3C electronics products and reliable manufacturing services.