Evaluating the Non-Inferiority of Airmod to Capnostream™35

This study is a multi-center clinical study of non-invasive medical device in Taiwan. After pre-anaesthesia evaluation, subjects who are suitable for intravenous general anesthesia (IVG) and age 20 years or older will be recruited in this clinical study. 150 subjects will be recruited at this site. The total 300 subjects will be recruited in other clinical centers at En Chu Kong Hospital simultaneously and Cathay General Hospital and Doctor Huang, Chien-Chung of the Anesthesia Department of MacKay Memorial Hospital is the PI of this study. The objective of this study is to evaluate the respiratory rate monitoring performance of "Airmod" respiratory monitoring assistant software, used with the "AccurSound Electronic Stethoscope AS-101" (TFDA Certificate No. 007347) compared to the "Medtronic Capnostream™35 Portable Respiratory Monitor" (TFDA Certificate No. 032283), hereinafter referred to as "comparison method", is non-inferiority than the comparison method. In addition, in order to improve the quality of patient care and ensure safety, this study will also synchronously record the breathing sounds from the " AccurSound Electronic Stethoscope " during the study with the respiratory symptoms of the comparison method, such as: asthma sounds, phlegm sounds, airway infiltration, water accumulation, obstructive sounds, respiratory arrest and respiratory tract edema, and analyze the vital signs for further improvement in the future. Primary Objective: To evaluate accuracy and performance of respiratory rate (RR) measurement from Airmod compared to the comparison method. The primary objective is to establish the non-inferiority. Secondary Objectives: 1. To assess the accuracy of respiratory ate measurement by Airmod comparison with manual-scored auscultation sound during the less sensitive period of Capnography on the comparison method. 2. To measure the agreement between AirRR\* and ManCRR\*. 3. To evaluate the response time of the first breath detection followed by admin