What I built: A 3-stage frequency sequence (165Hz → 440Hz → 528Hz) tuned for different water/dust scenarios, device-specific profiles covering iPhone, Samsung, Google Pixel, Xiaomi, OnePlus, AirPods and other wireless earbuds, laptops, Bluetooth speakers, and Apple Watch, an AI-powered diagnostic mode, and a companion Android app — plus the full SEO strategy, technical audit, and content plan behind the site.