About leagend

Shenzhen Leagend Optoelectronics Co., Ltd. (“Leagend”) was founded in 2005. We are a technology-driven, product-development-oriented, specialized, sophisticated, distinctive, and innovative high-tech enterprise. Our core technologies and product lines primarily cover automotive electronics, professional battery testing, and battery monitoring.

PERSIST IN INDEPENDENT PRODUCT DEVELOPMENT AND LEADING PRODUCTS WITH TECHNOLOGIES

Since our establishment in 2005, leagend has remained focused on independent product design, technological advancement, and research and development. Guided by the philosophy that “products come from the market and serve customers, while technology supports products and must lead product innovation,” we have developed a number of industry-leading product lines and solutions, including battery testers, battery protectors, battery monitoring systems, car jump starters, super lead-acid batteries, OBD diagnostic tools, and thermal imaging devices.

Today, our R&D team accounts for 40% of our total workforce, and our investment in technology and research and development represents 30% of annual revenue. Over the years, leagend has grown into a market- and customer-oriented, technology- and R&D-driven manufacturing enterprise with integrated production and sales capabilities, and has become one of the world’s largest manufacturers of battery testers.

40%
Technical
Staff Ratio
30%
R&D Investment
Ratio
7
Product
Lines
20
Technology
Solutions

build win-win co-existence with customers & serve the whole world

At leagend, we have always believed in building strong, friendly, and long-term partnerships with our customers. Our core business values are centered on understanding customer needs, creating real value for our customers, and delivering practical solutions that support their success.

Over approximately 21 years of growth, we have served more than 1,000 professional customers worldwide. We have also built a mature project development process, a professional quality management system, and service and delivery mechanisms that stand out in the industry. Throughout our journey, we have remained committed to working hand in hand with customers across the globe to achieve a true win-win outcome for customers, users, and the market.

DELIVERY IS THE BRIDGE AND WITNESS OF VALUE REALIZATION

We are deeply grateful for the trust and long-term cooperation of our global customers. Every year, we continue to expand our production facilities and strengthen our supply chain system to significantly enhance our delivery capacity. In 2025, we achieved 100% on-time delivery and 100% customer satisfaction.

For us, delivery is not only about the number of orders fulfilled, but also about the quality of the products we provide and the value we create for our customers.

100%
60+
SOFTWARE
COPYRIGHTS
60+
INVENTION &
RELATIVE PATENTS
20+
RELATIVE
CERTIFICATIONS

FOUNDER BACKGROUND:
DRIVEN BY BOTH TECHNOLOGY AND AESTHETICS

Eric, founder of Shenzhen Leagend Optoelectronics Co., Ltd., has a rare interdisciplinary background in both engineering and art, and has long been dedicated to bridging the gap between electronic technology and product design.



Technical Foundation: He graduated from Shenzhen University with a degree in Radio Technology from the Department of Electronics. In his early career, he focused deeply on electronic principles and circuit logic, building a solid foundation for product research and development and ensuring that our products meet rigorous standards for functional stability and technical performance.

Aesthetic Elevation: He later pursued graduate studies at the Central Academy of Fine Arts. Building on his engineering mindset, he deliberately expanded into the field of artistic design, systematically studying formal language and user experience. This represented a transformation from “making electronic products” to “creating designed works.”



This unique path enables him to define products from two perspectives at once: he understands both the limits of technology and the warmth of aesthetics. As a result, leagend’s products combine strong technical capability with refined visual appeal in a highly competitive market.

After the enlightenments of these two journeys and thanks to the inspiration from the modern legend characters and achievements, he built the leagend brand.

The name Leagend is derived from the word “Legend”, but reimagined and elevated.


The distinctive “a” in Leagend represents:
● Art — signifying that art is a core driving force behind our brand and products.
● Ambition — symbolizing our aspiration to become the preferred choice in the industry.


Our brand mission is to honor the classics shaped by the union of technology and aesthetics. We do more than manufacture electronic products; through innovative applications of technology and the integration of humanistic aesthetics, we are committed to providing practical, high-quality solutions for users around the world.

Company culture

Mission

To serve the world through continuous technological innovation.

BUSINESS VISION

To become a global leader in technology innovation.

CORE VALUES

Innovation, dedication, and win-win collaboration.

Battery Testers: Quick Answers, Anytime

Don’t let a dead battery catch you off guard. leagend’s digital battery testers are compact, accurate, and simple to use — making it easy to check the health of your 12V or 24V battery in seconds.With clear readings on:

  • Voltage and State of Charge (SOC)
  • Cold Cranking Amps (CCA)
  • Battery health status
  • Cranking and charging performance

You can instantly decide whether your battery needs charging, replacing, or just monitoring. It’s smart, preventative car care that fits in your glovebox.

Battery Monitors: Real-Time Status, Right in Your Pocket

leagend’s Bluetooth and 4G battery monitors keep you constantly connected to your car battery’s condition — whether you're driving or parked. By pairing with a mobile app, you can remotely track voltage, charging cycles, and receive real-time alerts if the battery status changes. Ideal for:

  • Long-term vehicle storage
  • Electric or start-stop vehicles
  • Road trip readiness
  • Fleet and RV monitoring

You’ll always know if your vehicle is ready to go — or needs attention — without ever opening the hood.

OBD II Diagnostic Tools: Know What Your Car is Telling You

When your check engine light turns on, don’t panic. leagend’s OBD II diagnostic tools make it easy to understand what’s wrong — and how to fix it. Just plug into your car’s OBD port to:

  • Read and clear engine fault codes
  • Reset the check engine light
  • View live engine data and freeze frames
  • Access vehicle info like VIN, I/M readiness, and more

Perfect for both beginners and car enthusiasts, leagend scanners help you avoid unnecessary trips to the repair shop and take control of your vehicle’s diagnostics.

8-Step Smart Battery Chargers: Restore, Maintain, Protect

A battery charger should do more than just add power — it should protect your battery. leagend’s 8-step intelligent battery chargers are engineered to safely charge and extend the life of lead-acid and lithium batteries.Key features include:

  • Automatic desulfation for aging batteries
  • Multi-stage charging for optimal performance
  • Maintenance/trickle mode for long-term storage
  • Compatibility with AGM, GEL, SLA, and LiFePO

Batteries Whether you're reviving a dead battery or maintaining a seasonal vehicle, leagend chargers keep your power system in top condition.

Thermal Imagers: See What Headlights Can't

leagend’s automotive thermal imagers are your extra pair of eyes in the dark — enhancing safety by detecting hidden driving hazards such as animals, pedestrians, and obstacles that are difficult to see at night or in fog, rain, and snow. These devices are especially valuable for:

  • Nighttime driving in rural or wooded areas
  • Navigating in low-visibility conditions
  • Detecting heat signatures beyond headlight range
  • Identifying potential road hazards early

Mounted on the vehicle and displaying thermal images in real time, these tools help drivers react faster and make safer decisions on the road. It’s like upgrading your vision — for every drive.

why
Drivers Trust leagend
?

Here's why leagend has earned the loyalty of over 10 million users worldwide:

Professional-Grade Accuracy

in tools designed for consumers

Wide Product Range

covering diagnostics, charging, monitoring, and safety

Smart Connectivity

with Bluetooth, mobile apps, and wireless sync

Easy to Use

— no mechanical background needed

Reliable Quality

backed by two decades of R&D and global certifications

Development milestones:
Every Step is Forward

2005.6.22
Company founded；
2006-2008
Built the R&D team and entered the digital electronics solution sector, including MP4 and digital photo frame solutions；
2006-2024
Deepened expertise in OBD automotive diagnostic systems, covering R&D, manufacturing, sales, and global market expansion；
2010-2014
Designed, developed, manufactured, and sold 3D glasses and 3D projection products;
2014-2024
Focused on battery research and developed battery testing technologies, including design, R&D, manufacturing, and sales;
2024
Expanded production facilities and capacity, becoming one of the world’s largest battery tester manufacturers;

Chairman letter to
customers & partners

To our valued customers and partners,

leagend is sincerely grateful to all of our customers and partners around the world for your continued support and companionship.

We have always upheld the entrepreneurial philosophy of “advanced technology, independent product development, and win-win cooperation,” and have always taken “creating customer value” as the only standard for our market operations.

Over the past 20 years, global technology has advanced at an astonishing pace—from the rise of the internet and the widespread adoption of smartphones, to the application of VR and AR technologies, the emergence of the Internet of Things, the development of big data, the implementation of intelligent driving assistance, and the rapid growth of artificial intelligence. These advancements have made the world full of both opportunities and challenges.

Yet the people of Leagend have remained steadfast in focusing on our industry, identifying real market needs, investing in industrial technology research, and pursuing independent innovation to uncover opportunities in emerging market spaces. It is precisely because of our unwavering commitment to technological and product innovation that, over the past 20 years, our technologies have consistently helped lead industry development, and our products have effectively filled gaps in new market demand while earning recognition from many professional customers around the world. Whether in our early entrepreneurial years, during the COVID-19 pandemic, or in today’s ever-changing global landscape, our spirit of innovation has never changed—and will never waver in the future.

As a specialized, sophisticated, distinctive, and innovative high-tech enterprise, leagend respects technology, respects the market, and above all, respects our customers.

We sincerely thank you for your continued support and companionship, and we look forward to working closely with both new and long-standing customers around the world to share the achievement of win-win cooperation.

Chairman