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Review title: Good for certian applications
Product review: I am not sure this is a great device to use to eavesdrop on others as implied in the description. However, it works well as an inexpensive amplified microphone for electronic projects. I used it to drive a modulator on a laser for a classroom laser communication project. For this purpose, it works well for a very good price.The one problem with it is that there is no power light so it is easy to accidentally leave on and drain the batteries. Since they are watch batteries, you probably don't have a spare lying around the house. Fortunately, the batteries are available at Walgreens and similar drug stores.
