A US-based client had invested several million dollars working with a local design firm to develop an innovative new smart security lock product. The client then engaged Shenzhen MHC to handle Design for Manufacturing (DFM) and mass production. However, when the first lock samples were produced, serious issues emerged that rendered the product nearly useless.

After receiving the smart security lock product samples, our engineering team at Shenzhen MHC conducted thorough testing and discovered major defects:

• Structural design flaws – The mechanical construction was fundamentally unsound.
• Hardware design issues – Critical electronic components were incorrectly specified and arranged.
• Unstable voltage & current – Power delivery was erratic, posing significant safety and performance risks.
• Excessive standby current – The product consumed far more power than specified. It could not meet the client’s core requirement of 4 years of standby operation.

In short, the smart security lock product as designed by the US firm, simply did not work reliably. The client was facing the prospect of losing their entire multi-million dollar investment.

Instead of simply reporting the problems, Shenzhen MHC’s team took immediate action:

• Rapid, transparent feedback – We documented every issue with test data and shared it with the client in a clear, actionable report.
• On-site demonstration of fixes – Our engineers proposed specific structural and hardware modifications. To prove the solutions worked, we modified a sample on the spot and demonstrated the improved performance to the client via live video.
• Complete redesign of critical systems – We corrected the structural design, re-engineered the hardware layout, and optimized the power management circuit. The standby current was drastically reduced, achieving the required 4‑year standby life while ensuring stable voltage and current under all operating conditions.

The client was extremely satisfied with both the outcome and the speed of our response. Seeing the working sample and the professionalism of our team, the client made a decisive choice:

• All structural modifications – entrusted to Shenzhen MHC.
• All hardware design and production – moved from the US design firm to Shenzhen MHC.

The product is now on track for successful mass production, meeting every performance and reliability target.

This case demonstrates what makes Shenzhen MHC a trusted partner for complex product development:

Rapid feedback – We identify problems early and communicate clearly.

Effective response – We don’t just point out issues; we provide proven solutions.

One-stop R&D capability – From DFM to structural and hardware design, and finally to mass production – we do it all under one roof.

“Shenzhen MHC turned a potential disaster into a success. Their engineers didn’t just test – they fixed. We now have full confidence in their ability to deliver high-quality products.”

– Senior Product Manager, US Client