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Device Category: Watches. Device Group: PRO TREK. Brand Model: Casio PRG550-1A1. Title, Pages, Format, Size, Action. Casio PRG550-1A1 Manual. Manual. FAQs · Manuals · Downloads · Daylight Saving Time (DST) / Summer Time Adjustment · Computer OS compatibility · Smartphone compatibility · Video Tutorials. After 5 years I can no longer change the time. Reviewed in the United States on May 3, 2019. It worked great for 5-1/2 years then the CASIO PRO TREK Official Website MANUAL page. Use this page to download a copy of CASIO watch manuals in PDF. To download a PDF file, In the Timekeeping Mode, hold down E until each of the following steps occurs. Hold SET appears on the digital display. ➝ HT flashes. ➝ Second-hand points to Casio 5213 Pdf User Manuals. View online or download Casio 5213 Operation Manual.