Sine-wave control is the advanced digital processing of the electrical signal to make the motor run as smoothly and efficiently as possible. This technology is what makes the Bravo Milano 9,000 BTU virtually silent during operation. It is a critical component of the Penta-Zone systems, ensuring that five motors don't create electrical interference. To protect the sophisticated control boards, using the heavy-duty wiring from our Installation Kits is highly recommended. If you notice any electrical humming, upgrading to a high-quality Wall Bracket can help isolate any remaining resonance. You can find more technical Other Accessories to help fine-tune your electrical setup in our online shop. This digital precision is a hallmark of the Bravo Milano commitment to modern engineering.