One ring to decode them all.

With all the radio frequency receivers, call tapping and wireless jamming devices around you have got no privacy. It might be time for your to go a little old school on sending your private messages. Use something like the Secret Decoder Ring, small enough to take anywhere and doesn't need any power to function. It is made of stainless steel and comes in three sizes. To operate simply turn the lower half of the ring to reveal the numbers and start decoding!

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Under $25