... calendars are:We do all processings in-house ,including electronic IC/PCB design, offset colorful printing , molding,die cast,package ... from our good production and services.Item Name: 3D Electronic Poster ,Educational Poster, Kids Early LearningTHe chart Encourages ... cmBattery: (Not included). 1. Material: PVC , Paper, and electronic elements, IC, PCB, etc. . 2. Various Size available: 42*56cm etc; ...