Abstract: Quantified Self (QS) is a critical approach for individuals managing their personal health through wearable devices. Understanding the functional elements in these devices and the way their configurations influence user satisfaction is essential for optimizing product design and enhancing the self-quantification experience. Grounded in the theory of Perceived Affordance, this study identifies five primary elements and eighteen secondary elements that affect QS devices, based on insights gathered through interviews and a review of relevant literature. Empirical analyses were conducted from both expert and user perspectives using the Analytic Hierarchy Process (AHP) and crisp-set Qualitative Comparative Analysis (csQCA) to rank these elements and map the configurational pathways leading to user satisfaction. The results reveal that perceived cognitive affordance is the most influential among the five primary elements, while convenient operation is the top-rated secondary element. Additionally, four distinct configurational paths based on the primary elements significantly impact user satisfaction evaluations.