Casio BGM-220LV Manual — Modules 2461 / 2255

One owner's manual PDF for the Casio module 2461 in English. Casio fitted it in the BGM-220LV. The same document also covers module 2255. For module 2461, Casio's spec sheet lists one CR1620, with 1.5 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Nov 2001.