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A high school in Hangzhou City, Zhejiang Province located on the eastern coast of China, has employed facial recognition technology to monitor students’ attentiveness in class.

At Hangzhou Number 11 High School, three cameras at the front of the classroom scan students’ faces every 30 seconds, analyzing their facial expressions to detect their mood, according to a May 16 report in the state-run newspaper The Paper.

The different moods—surprised, sad, antipathy, angry, happy, afraid, neutral—are recorded and averaged during each class.

A display screen, only visible to the teacher, shows the data in real-time. A certain value is determined as a student not paying enough attention.

A video shot by Zhejiang Daily Press revealed that the system—coined the “smart classroom behavior management system” by the school—also analyzes students’ actions, categorized into: reading, listening, writing, standing up, raising hands, and leaning on the desk.

An electronic screen also displays a list of student names deemed “not paying attention.”

The school began using the technology at the end of March, vice principal Zhang Guanchao told The Paper. Zhang added that students felt like they were being monitored when the system was first put in place, but have since gotten used to it.