I recently purchased a second one to use in my elementary classroom for an attention getter (lost my first one). It's simple to use, as you just plug it in and go. I didn't tell my class about it at first and for the first week and half no one knew what it was. Two students even opened the classroom door and looked for an actual doorbell lol. We all got a chuckle out that and I showed/told them what it was after that.
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