Casio EF-517D / EFX-500BK Manual — Module 4389

One owner's manual PDF for the Casio module 4389 in English. Casio fitted it in the EF-517D, EFX-500BK, and EFX-501SP. Casio's spec sheet lists one SR927W, with 2 years of battery life and accuracy within ±20 seconds a month; the module first shipped in May 2007.