RGBlue BM6200G, Инструкция по эксплуатации

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Maintenance before Use
The 100-meter waterproofing of this product is retained by the
close contact between the O-ring of the Light Module, its O-ring
groove and the O-ring applying surface of the Battery Module.
Including the first use after purchase, be sure to perform the
following maintenance before using this product underwater.
·The O-ring is a consumable part, which should be replaced at
least every year. If any irregularity such as the one mentioned on
the next page is found, be sure to replace it with a brand-new
O-ring.
·Always use the specified silicon grease.
O-ring groove
O-ring applying surface
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