They make noise, too.
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What makes them chirp I don't know, but it is a high tone chirp that's almost out of the audible range. If you plan to buy one of these, be aware you may hear it if you are in the same room with it while it's sleeping. The chirp sound goes with the blink on the power button, when the light comes on it makes a chirping sound almost like a high toned phone ringing in the distance. Annoying, but they were a good deal.