## 4 Result  
### Validity of Questionnaire  
[PERSON]'s alpha was used to assess the internal consistency of the questionnaire and to test its reliability. The reliability is usually considered acceptable when [PERSON]'s alpha coefficient is greater than 0.6. The suitability of the questionnaire for factor analysis is mainly tested by KMO and Bartlett's sphericity tests [42; 43]. Both KMO and Bartlett's sphericity test results validated the sampling adequacy of the data set, and exploratory factor analysis using principal component extraction was performed to test the structural validity of the scales. In addition, each measure had a standard value factor loading of greater than 0.4 [44]. It shows that the structure has sufficient convergence validity.  
The results of the statistics and questionnaire test of the variables are shown in Table 3. The reliability analysis results show that the internal consistency of the questionnaire is high because \(\alpha\) of [PERSON]'s alpha is between 0.649 and 0.859 [45]. In addition, the extraction amount of the factor load is greater than 0.4, and the KMO value is 0.769, which means that the questionnaire demonstrates good validity.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Dimension** & **Response Symbol** & **Definition 1** \\ \hline \multirow{3}{*}{Perceived playfulness (PP)} & PP1 & It can be used to decorate the interior space, which is very interesting. \\  & PP2 & This is a device I never thought about. It makes me feel crazy. \\  & PP3 & It can automatically emit scent and interesting settings. \\ \hline \multirow{3}{*}{Perceived usefulness (PU)} & PU1 & Using it to refresh yourself when driving. \\  & PU2 & Using it makes me more focused on driving tasks. \\  & PU3 & Using it improves in-car odors and creates good driving conditions. \\ \hline \multirow{3}{*}{Perceived ease of use (PEOU)} & PEOU1 & Getting road information through it is simple. \\  & PEOU2 & It is easy to operate and handle. \\  & PEOU3 & It is easy to use it to interact with people and the road environment. \\ \hline \multirow{3}{*}{Attitude to use (AU)} & AU1 & It is a significant invention. \\  & AU2 & It is worth using money to buy it. \\  & AU3 & It satisfies all my imagination of car perfume. \\ \hline \multirow{3}{*}{Intention to use (IU)} & IU1 & I would like to try to use it. \\  & IU2 & I will always use it later. \\ \cline{1-1}  & IU3 & I will recommend it to my friends. \\ \hline \multirow{3}{*}{Perceived Risk (PR)} & PR1 & It may have security risks. \\ \cline{1-1}  & PR2 & It will waste money and resources. \\ \cline{1-1}  & PR3 & It distracts my attention while driving. \\ \hline \hline \end{tabular}  
* \({}^{1}\) The word “it” refers to the VP-ADD.  
\end{table}
Table 2: Definition and description of questionnaire variables.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Factor** & **Cronbach’s Alpha** & **Mean** & **Response** & **Mean** & **Factor Loading** \\ \hline \multirow{3}{*}{Perceived playfulness (PP)} & & PPI & 3.68 & 0.718 \\  & & & PP2 & 4.05 & 0.850 \\  & & & PP3 & 4.50 & 0.676 \\ \hline \multirow{3}{*}{Perceived usefulness (PU)} & & & PU1 & 4.00 & 0.802 \\  & 0.780 & 4.01 & PU2 & 4.31 & 0.854 \\  & & & PU3 & 3.71 & 0.686 \\ \hline \multirow{3}{*}{Perceived ease of use (PEOU)} & & & PEOU1 & 2.41 & 0.893 \\  & 0.859 & 2.53 & PEOU2 & 2.35 & 0.866 \\  & & & PEOU3 & 2.84 & 0.834 \\ \hline \multirow{3}{*}{Attitude to use (AU)} & & & AU1 & 3.76 & 0.834 \\  & 0.762 & 3.88 & AU2 & 3.69 & 0.742 \\ \cline{1-1}  & & & AU3 & 4.19 & 0.653 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Statistics and questionnaire test of the variables (KMO = 0.769).