Wow, I'm impressed! Perplexed smiley is looking completely puzzled. Is positively or negatively surprised: from mildly astonished to completely steamrolled.
The face with open mouth emoji was introduced in 2012 and released as part of the Unicode 11.0 standard. This emoji can be found under the smileys and emotions
category. Because the face with open mouth emoji has been around for quite some time, it should display correctly in the majority of operating systems.