KOKUYO Adult Motivation Pen with Both iOS and Motivation [Compatible Android] (Adult Pen)

Simply attach it to your regular pen to record and analyze your study efforts. Compatible writing instruments: mechanical pencils, ballpoint pens, stylus pens, etc. *Approximate size of compatible writing instruments: diameter 9-13 mm *Cannot be attached to regular pencils (diameter 8 mm or less) Weight: Approx. 8g Size: Main unit: 24 x 30 x 22mm Charging case: 51 x 51 x 35mm Charging method: Main unit: Charge in the case Charging case: Charge via USB (USB Type-C) *USB cable not included Duration: Approx. 7 days (assuming 2 hours of study per day) This product is designed for use in Japan. It is not compatible with overseas standards. For all adults who are struggling to continue studying for qualifications. An ultra-compact and lightweight learning device that supports those who give up after three days.