“ZimuPlus Caption Box” is such a smart assistive product that mainly provides real-time verbatim caption service for the hearing-impaired people and the partially-deaf elderly. It can be directly tuned to the news broadcasting, online course, conference presentation and other contents at any time, for which the caption is highly needed by hearing-impaired groups. “ZimuPlus Caption Box” can be widely applied in such scenarios as schools of hearing-impaired students, conferences of hearing-impaired attendees, museum guide to visitors, information accessibility window services, among others. Compared with traditional speech-to-text products, the combination of live screen image and real-time verbatim caption within “a single screen” of “ZimuPlus Caption Box” is more user-friendly, thereby greatly enhancing “immersive” experience of viewing and online course learning. Moreover, “ZimuPlus Caption Box” features better quality of audio input through the circuit and the higher recognition rate, which is thoroughly free from environmental noise.