Excellent! We used them in an electrical workshop. I asked the kids to connect them to our Squishy Circuits. They were a hit but beware they are quite loud. They sound almost like a fire alarm. With a little more resistance in the test, the sound was quieter and more manageable in the larger group. We made a rule that you can only connect them for a few moments at a time. Overall I am very happy that I bought them. If necessary I will buy again.
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