Home & Kitchen > Doorbell & Chime
Wireless Doorbell Plug-in SIGMA-LKM3013
Brand: Generic / OEM
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Audited BOM: 12 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 low-cost RF module and poorly optimized antenna (ENG-002) cause reception failures (RMA-001), leading to complaints about range and instability (REV-001, REV-003).
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