Sealife DIGITAL FLASH - Manual (Page 52)

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c. Test flash arm flexibility underwater. The flash arm will become
stiffer underwater.
6. Rust accumulating around power on and test swtich. The switch
is magnetic and will attract metal debris, like rust, from a shipwreck.
Clean off rust and metal debris with a brush.
7. For more trouble shooting information, refer to the SeaLife
website at www.sealife-cameras.com or contact your local SeaLife
service center for help.