Answer to "What speaker is needed to replace the ones inside? Mini Lifejacket 3"Hey Russell. I’m not sure if I can find an identical speaker to the one in the lifejacket, but I wonder one with the same measurements would be a suitable replacement. You’ll have to measure the speaker yourself (as I don’t own one), but this one is 40mm diameter, 20mm height, which seems in the ballpark. As far as the wires go, I would try to resolder the original ones rather than find a replacement for them given that white plastic harness they’re attached to.