Piezo Electric Crystal Earphone Sensitive High Impedance Ceramic Ear Piece 3.5mm for Transistor Radio/Crystal Radios DIY Electronics Projects 1/8 inch Audio Jack Connector Wire Piezoelectric Element

I use these for building crystal radios and they work perfectly. I just remove the auxiliary end then separate and strip the wires, and they are ready to go. I've used several of these earpieces and they always work just fine. The only thing is they are fragile, so you don't want to drop them..otherwise the plastic part that goes in your ear pops right off. I've used a small 3d printed plastic cap to replace one piece that has broken off before, and it still worked good as new. Would recommend!

I don't like the earphones: the sounds cuts in and out randomly; the ear piece doesn't stay in my ear at all.

Good quality

Good stuff, i am buying another one. Thank you.

Works but still having trouble getting circuit to work, too much interference or bad antenna and ground connection.

Works great, just like the old time Radio Crystal set and transistor radio ear plug of mid century era, very pleased!

I initially liked how these were packaged and that they're still being made, I really wanted to like them. However, they're all made in China now and the wiring is very finicky to say the least, to the point that the sound cuts out completely with just slight movement of the wiring. I bought 3 of them, and so far 2 of the 3 are finicky.. the third I haven't used yet, but I'm betting it's not any better.Buy at your own risk, personally I would buy an original from the 70s off ebay.

You get what u pay 4 knot good.