Wearable industry shipment and use prediction is increasing until 2026, especially smartwatches. In this pandemic phenomenon, smartwatches have become more critical because they can monitor fitness activities and rest in detail. In addition, the technology contained in the smartwatch must also be considered. The advanced technology available may make some users feel discomfort and insecure. This study is formed to consider the technology readiness index (TRI) such as optimism, innovativeness, insecurity, and discomfort in the technology acceptance model (TAM) towards user acceptance in using their smartwatch. 192 respondents filled out an online survey and then tested it using the PLS-SEM method. The result showed from 12 hypotheses that three hypotheses have no significant impact. Insecurity has no significant impact on perceived ease of use and usefulness. Optimism also has no significant impact on influencing perceived usefulness.