※ This pen is designed for right-handed users only. ※ Two CR927 batteries are included, but please be aware that they may be depleted due to long-term storage. Please prepare replacements yourself if necessary. The RISU Smart Posture Improvement Pen is equipped with a 360-degree proximity sensor and a microchip. The sensor automatically detects the distance between the pen tip and the eyes. When the user slouches, the pen tip retracts, and it extends again when the user returns to a good posture. It has been upgraded to a metal pencil that doesn't need sharpening and allows for long writing sessions. It replicates the smooth writing feel of a pencil. Using a triangular grip that guides the user to the correct way to hold the pen, the user can naturally grip the mechanical pencil correctly by placing their thumb, index finger, and middle finger along the three sides of the triangle, making it perfect for children who are using a mechanical pencil for the first time. In addition to the weight of the chip and sensor, the use of metal for some parts provides a low center of gravity and stability, achieving the appropriate weight needed for writing carefully. The pen uses CR927 batteries. The replacement目安 (estimated time) is about 2 months. There is individual variation because the pen tip retracts more frequently when the posture is poor, leading to faster battery consumption.