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About
Building trusted access for global distributors
SJJ is the smart lock brand of Shenzhen Kangzhi Technology Co., Ltd. We supply fingerprint, keypad, aluminum-door, face recognition, and camera locks with Tuya & TTLock ecosystems — at wholesale pricing with OEM options.
Based in Shenzhen, Guangdong, China, we serve wholesale buyers, importers, and OEM partners across Europe, North America, and the Middle East (GCC). Our catalog is CE, FCC, and RoHS certified where applicable, and built for the door types and compliance requirements of these markets.
What we stand for
Smart locks sit at the intersection of security and convenience. Our buyers — importers, wholesalers, apartment operators, and hospitality projects — need products that install cleanly, connect reliably, and clear compliance checks in Europe, North America, and the Middle East.
We focus on practical catalogues: lever locks, deadbolts, aluminum door systems, peephole camera models, and padlocks. Every certified line ships with CE, FCC, and RoHS coverage where applicable.
How we work with partners
- Own-brand wholesale — ready SKUs with volume pricing for distributors and retailers.
- OEM customization — logo, packaging, and branded kits for your market.
- App ecosystems — Tuya and TTLock options your end users already understand.
- Market fit — residential, apartment, hotel, and aluminum-door lines matched to EU, US, and GCC door standards.
Quality & compliance
Certified products carry CE, FCC, and RoHS marks. Factory inspection and finished-product checks are part of our supplier workflow. Ask sales for certificates matching the exact SKU you plan to import.
- CE
- FCC
- RoHS
Manufacturing & OEM capabilities
Shenzhen Kangzhi Technology runs a vertically integrated smart lock production line. From PCB assembly and firmware programming to finished-product aging and packaging, we control the steps that affect reliability and lead time.
- 01
PCB & SMT
In-house SMT lines for fingerprint modules, keypads, and WiFi boards.
- 02
Assembly
Lock body, motor, clutch, and sensor fitting with jigs for consistency.
- 03
Testing
Functional, aging, and environmental tests before goods leave the line.
- 04
Packaging
Neutral or branded packaging, manuals, and accessory kits per order.
Markets we serve
We ship to distributors and project buyers across Europe, North America, and the Middle East. Our SKUs are built around the door types and certification needs common in these regions.
Europe
CE-marked lines for EU customs and retail compliance.
North America
FCC-covered RF products for US and Canadian imports.
Middle East & GCC
Aluminum-door form factors for UAE, Saudi, and Kuwait projects.
Why buyers trust SJJ
We are a smart lock manufacturer, not a trading company. Our production line, technical team, and quality control are based in Shenzhen, giving buyers direct access to engineering support and consistent lead times.
- Factory-direct
- PCB assembly, SMT, firmware, and final testing run in-house in Shenzhen.
- Certified catalog
- CE, FCC, and RoHS coverage where applicable for EU, US, and GCC imports.
- OEM ready
- Logo, packaging, firmware branding, and custom finish options for qualified orders.
- Market fit
- SKU lines matched to wood, aluminum, and apartment door standards in Europe, North America, and the Middle East.
Talk with our sales team
Share your market and door types — we'll recommend a starter assortment.