4D-UPA Purchase Assurance: Buy Confidently, Use Securely

Transparent & Traceable Sources

We source exclusively from verified channels to ensure authenticity:

• Direct from manufacturer and OEMs
• Authorized distributors
• Market-vetted traders (3+ years stable supply)

Every batch is traceable with documented proof of origin.

Quality Inspection Process

We enforce strict checks to ensure components meet standards:

• Visual: Appearance, markings, packaging, batch codes
• X-ray: Pad consistency (on request)
• Function test: Sample checks for specific models (upon request)
• Reports: Available upon request

Flexible Payments & Terms

We adapt to your project needs:

• T/T, PayPal, Credit Card
• Credit terms for long-term partners (e.g., monthly, Net 15/30)

Reliable After-Sales Support

365 Days warranty with streamlined solutions:

• Defective? Free returns/replacements
• Fast reshipment or refund
• Full-service sourcing: Procurement & payment support