Older adults with zero time of falls in the past twelve months will be treated as the reference group. Older adults with at least one time of falls in the past twelve months will use the device to assess their balance ability by attending three rounds of the tests.

Participants will engage in the device test, clinical assessment tests. The whole test will last twelve months, and the outcome will be assessed pre- and post-implementation for comparison and validation.

The intervention results are used to compared with traditional tests and clinical diagnosis, to identify whether the sensor provides a higher accuracy in predicting fall risk, and to explore the feasibility of the sensor in clinical scenarios.

A primary outcome is the precision assessment of falling risk prediction both from device and clinical diagnose.

The specific measurement variables for this primary outcome are the classification results of high/low falling risk based on the results (a composite result) of the device test and participants' actual falling incident indicators, including the number of falls, the severity of falling incidents after the device test, and medical history of the participants (eg. the history of the emergency, surgery, and diagnosed disease in the past three years), as well as the diagnosis results of the fall risk by clinical professionals. These results can be shown through the sensitivity and specificity analysis of the device evaluation.

The secondary outcome is the specific fall risk results given by the device and the participant's body data measurement, demographic information, and survey data about user experience and adoption.

Additionally, the ideas from clinical professionals on the better application of the device in hospitals will also be regarded as the secondary outcome of this study.