Casio PRT-41 / PRT-410 Manual — Modules 2198 / 1998

Two owner's manual PDFs for the Casio module 2198, each a different scan (English included). Casio fitted it in the PRT-41 and PRT-410. The same documents also cover module 1998. For module 2198, Casio's spec sheet lists two SR927W cells, with 1.5 years of battery life and accuracy within ±15 seconds a month; the module first shipped in Nov 1999.