Here's the specs of the CT-S100: https://www.casio-intl.com/asia/en/emi/products/cts100/spec/ The specs of the CT-S200: https://www.casio-intl.com/asia/en/emi/products/cts200/spec/ And the specs of the CT-S300 https://www.casio-intl.com/asia/en/emi/products/cts300/spec/...