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FX-991 ESPLUS-2WDTV is a type of scientific calculator and includes up to 417 functions. It is especially suitable for Grade-9 to Grade-12 students, engineering students, and accountants. It is also especially suitable for GCSE/AS/A Level exams. It can be used with solar power when there is enough light, and it can be used with battery power when there is not enough light. Two Way Power System When there is enough light, it can be used with solar power, and when there is not enough light, it can be used with battery power.