This book offers a practical exploration of ChatGPT Voice Mode as an interactive, adaptive, and context-sensitive tool to support speaking instruction. Designed as a hands-on manual, it not only discusses the theoretical foundations of AI-assisted language learning but also provides clear implementation guidelines, classroom activity examples, instructional scenarios, and pedagogical tips tailored for ESP and EFL instructors. Through a systematic and accessible approach, this book aims to help educators integrate AI technology into their teaching practices in an effective and responsible manner.