ProTechTrader Piezoelectric Ear Phone High Impedance Ceramic Piezo Ear Piece for Crystal Radios - Upgraded Brass Diaphragm with All Soldered Connections

It works very well. Not real comfortable but in that regard, they’re all about the same. Spend an extra dollar or two. These earphones are pretty good. 👍🏻👍🏻

Bought this for a “foxhole radio” I was building as a demonstration for radio classes. Allowed me to heard radio signals picked up on a wire with zero power put into the system, just the tiny bit of energy picked up by a 30’ wire and run through a handmade coil and a razor blade.

This is a solid-feeling earpiece with about 40 inches of attached cable, ending with two pre-tinned wires. With my crystal radio, these produce surprisingly good quality sound when placed in parallel with a 100k load resistor. The lower frequencies aren't exactly earth shattering, but they're not absent, either, so the resulting sound is fairly natural and not too tinny. The tips unscrew easily for cleaning. The inner diaphragm appears to be brass. I was so pleased with the first one that I ordered a second, so I can have an earpiece in each ear. Definitely helpful when zeroing in on those quiet stations.

Works fine with my crystal set, which is why I bought them.

Works as advertised great price and fast shipping.

Excellent high impedance ear piece. Works very well with entry level crystal radio projects.

This crystal earpiece is the best. This company had solved the problems the other ones all had.. I bought the other ones so I know. I would have given it a 5 star if the cord was.longer. I would pay extra to see this happen. Pay the money and buy these. These work very well and will save you some troubleshooting headaches.

Sound quality: Was having a hard time hearing my inner voice, so I thought this might work. Plus, my boss almost threw away all the quartz and amythest I bought him after he sent me to get "crystal" (without even specifying which kinds). After being fired, I'm planning to use this to make a crystal radio.