Electronics > Audio > Portable Audio & Accessories > Headphones & Earbuds > True Wireless Earbuds
TWS Wireless Bluetooth Earbuds EL-1520 with 300mAh Charging Case IPX4
Brand: Generic / OEM
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Audited BOM: 10 Components
RMA Chain & Defect Intelligence
Root cause causal graph linking factory engineering flaws to verified consumer return reasons.
⚡ Causal Link: Defect to Consumer Return
The use of low-cost MEMS microphones and the absence of effective ambient noise cancellation algorithms (DSP) in the Bluetooth chipset (COMP-001) result in poor voice pickup and amplification of background noise, leading to user dissatisfaction during calls (RMA-001, REV-001).
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