Hello,I am Israel from CIZAR CONSULT, We are required to supply calculators.Below are the features1. No ability to store external media such as texts, formulas, variables etc2. Durable with a long lasting batteryThe purpose is for College Examination. Initially students are notallowed to use calculator to prevent examination malpractice, this banhas resulted to recurrence of mass failure.We will appreciate if a customized calculator of the model (YH-3650MS)can be supplied.Thanks Show More