My sons (one of their friends) and I were on our cruise for 3 days so 4 of us used an extension cord. It has worked so well for us. The only downside I would say is that because it's square it partially blocks the exit of the other ship and makes it unusable. I think if it was a little smaller (maybe just 1/4 inch) it would be perfect. However, we got around this by unplugging one of the phone's chargers. This is a very small minus, because otherwise I like that we can connect 5 accessories at the same time.
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