My daughter has a science project -- she needs to build a beacon that remains dormant until activated by a signal that can then broadcast a unique frequency signal that can range between 100 to 300 feet; the beacon needs to be as small as possible, the size of a quarter or even smaller if possible. Would this be considered a medium range signal? What type of technology would we look at? Garage door signal? Bluetooth? Other? Please help. Thanks.
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