![Dug up my old CE-IV mp3 player. Runs off a AAA battery, but manual said there was an optional AC adaptor. Anyone know what kind of port this is on the left? ( Dug up my old CE-IV mp3 player. Runs off a AAA battery, but manual said there was an optional AC adaptor. Anyone know what kind of port this is on the left? (](https://external-preview.redd.it/XrrDr4raQPxHdhGEwpatWUUNUfpGNv28NOCPodWboe8.jpg?auto=webp&s=ebd990bdfb04d87c38cd3c9f9a7a7183a3ac341f)
Dug up my old CE-IV mp3 player. Runs off a AAA battery, but manual said there was an optional AC adaptor. Anyone know what kind of port this is on the left? (
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