Custom TWS Earbuds with Offline MP3 Playback: Rapid, Cost-Effective OEM Solution for a Spanish Tech Brand
Introduction: The Client's Vision & Our Role
In early 2025, a Spanish tech brand approached GoodwayTechs with a clear yet complex request: to create True Wireless Stereo (TWS) earbuds with standalone MP3 playback—without relying on any smartphone or app. Their vision? A music playback solution that worked completely independently, featuring internal storage, a touchscreen interface, and strong battery performance, all within a competitive cost and timeline.
They needed an OEM partner who could not only deliver custom firmware and hardware but also reduce the traditionally high costs and long lead times often associated with new product development. GoodwayTechs stepped in as that partner.
The Challenge
The client originally explored smart wristbands, but soon shifted their focus to TWS earbuds. Their new requirement introduced multiple technical and cost-related challenges:
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Standalone MP3 Functionality: No smartphone, no app, just onboard storage and decoding.
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16GB Internal Storage: Enough capacity to store hundreds of songs.
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Touchscreen Charging Case: A premium feature uncommon in most OEM offerings.
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Battery Life: At least 8–9 recharges via the case, and a minimum of 4 hours playback per charge.
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Cost Management: Avoid expensive tooling like custom molds, which can cost $30,000+.
Our Strategic OEM Solution
GoodwayTechs’ in-house R&D and full-stack OEM/ODM capabilities allowed us to offer a smart, cost-effective path forward.
Hardware Customization:
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Base Model: We proposed modifying our existing Model J6, avoiding high tooling costs.
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Memory: Integrated 16GB of flash memory.
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Battery: 800mAh charging case + 40mAh earbuds.
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Interface: Touchscreen charging case for intuitive playback control.
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Connectivity: USB-based file transfer for offline MP3 upload.
Firmware Engineering:
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Offline MP3 Decoding: Developed custom firmware to decode and play MP3 files natively.
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User Interface: Enhanced UI for ease of use with touchscreen.
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Standalone Mode: No Bluetooth, no phone pairing required.
Timeline & Cost
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Prototype Lead Time: 15 days
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Mass Production Lead Time: 30 days for 3,000 units
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Development Fee: $2,000 (refundable with order)
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Unit Price: $15/set at MOQ 3,000
This rapid development timeline gave the client an efficient market entry point with minimal risk.
Client Validation & Green Light
The client emphasized a crucial requirement: it must work exactly like a standalone MP3 player.
Our engineering team demonstrated the following:
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Drag-and-drop MP3 file transfer via USB
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Full playback without needing to pair with a phone or use any app
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User-friendly touchscreen navigation
Upon confirmation, the client approved prototype production and appreciated the ability to test the market before committing to larger investment. The risk-managed approach and transparent pricing further strengthened their confidence.
Why This Project Was Successful
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Smart Model Adaptation: Leveraged existing product (Model J6) to skip mold development.
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In-House R&D: Owned both firmware and PCBA design, enabling fast iteration.
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Clear Communication: Frequent updates and quick turnarounds.
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Cost Control: Balanced innovation with affordability.
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Speed to Market: 45 days from idea to production-ready batch.
Conclusion & Call to Action
This case exemplifies GoodwayTechs’ ability to turn niche concepts into real-world products—quickly, affordably, and without compromising on quality or features. Whether you're a startup with a unique idea or an established brand looking to differentiate, we offer:
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Fast prototyping
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Custom firmware + hardware design
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Low MOQ flexibility
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Transparent pricing
👉 Looking for a custom audio solution?
Visit www.goodwaytechs.com or email us at info@gwtechonline.com to discuss your project today.