ElfEar is a smart student sitting protection device that only needs to be worn on the ear. It uses high-precision sensors and gesture algorithms for intelligent sensing and intelligent voice reminders. If the monitoring system determines that the child's sitting posture is incorrect, an audible prompt will sound. With the voice prompts, you can move your posture, every positive response will be recorded, and finally will be reflected in the score and daily progress curve, and parents can make incentive rules with the child. In this way, the children not only get timely correction from the physical form, but also effectively recognize the psychological changes. This effectively corrects the bad sitting posture and also cultivates the child's self-management ability.