Does not occur. i bought one The sensor was not working properly. I verified this by simply placing it in a dark room, but the preloaded music played over and over. It was like a radio. I exchanged it. 2. earned. Sorts. The sensor worked normally but was unable to download music/sound to it as it was not recognized by my computer. (Despite the assurances in the instructions that it will be.) So he's going back, too. Even when it worked fine, the audio quality (judging by the preloaded music because that's all I could access) is so bad that it's useless. The person speaking sounds like someone is humming through the kazoo. Don't waste your time and money on this.
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