CYHAA is a tool that allows users to control real-world devices remotely using their phone. The tool was created by David Bello, who used the voice recognition engine from LavaRock HQ, which was developed by Twilio customer Kurtis Welch at Magma Software. CYHAA uses this technology to enable users to turn lights on and off, and potentially other devices, with just their voice commands. This project showcases the potential of using APIs and SDKs for building innovative applications that interact with physical devices.