Water-Activated Floating Keychain LED Strobe

From the website:

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Floating LED Keychain Strobe

If your keys go overboard, as soon as it hits the water this LED keychain puts out an S.O.S. with a flashing red light.

And it floats, so it's easy to retrieve your keys — no diving required!

Durable ABS plastic with replaceable batteries sealed tightly inside.

Bulb lasts 100,000 hours and never needs replacing.

Use as a mini flashlight to find a keyhole in the dark.

Will keep two keys afloat.

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FunFact: 100,000 hours = 4,167 days = 11.4 years.

$6.48.