Casio EF-108D / EF-123D Manual — Module 2723

One owner's manual PDF for the Casio module 2723 in English. Casio fitted it in 4 models, including the EF-108D and EF-123D — the full list is below. Casio's spec sheet lists one CR2016, with 3 years of battery life and accuracy within ±20 seconds a month; the module first shipped in Aug 2002.