JUST system releases the ‘Airpen storage notebook Limited Edition IV. The AirPen Storage Notebook is a writing pad with memory for you to store what you wrote without the need of a PC. You can write note and draw diagrams on the plain paper pad using Pentel new electronic pen with regular ink. The AirPen Storage Notebook will be able to store your work. It can store minimum 100 A5 notes into a memory unit.