KOKUYO Adult Motivation Pen ・Main unit: 1 ・Charging case: 1 ・Instruction manual: 1 I've used it a few times, but I haven't been using it lately, so I'm putting it up for sale. There are no noticeable scratches, but please purchase with the understanding that it is a used item. I try to ship within 24 hours. Compatible writing instruments: Mechanical pencils, ballpoint pens, stylus pens, etc. (Size guide for compatible writing instruments: diameter 9-13mm) (Cannot be attached to regular pencils (diameter 8mm or less)) Main unit weight: approx. 8g Main unit size: 24 x 22 x 30mm Charging case: 51 x 35 x 51mm Charging method: Charge in the case (USB Type-C) *USB cable not included. Battery life: approx. 7 days (assuming 2 hours of study per day) Compatible OS: Compatible with iOS 16 or later and Android 10 or later. Size / 15 x 23 x 107mm Weight / approx. 19g Compatible OS / iOS 11 or later, Android 7.0 or later Continuous operating time / approx. 5 days (assuming 40 minutes of study per day) Charging method / USB charging (micro USB) Charging time / approx. 2 hours