Chris-Wang Portable Pocket 6-Hole Solar Power Calculator Ruler for Universal A5/A6/B5 Binder Planner/Notebook/Personal Organizer/Planner Dual power calculator with auto-shut-off With side ruler 8 digital display Size: 8.6x15.7cm, designed for use in Universal Notebooks sized A5/A6/B5 Package included: 1 x Filofax Calculator(Other items are not included)