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How to reduce the range of bluetooth signal?

Hello;

We are developing software project and need a beacon device to use in this project.

The UUID of the device needs to be changeable. And the bluetooth signal must be within a maximum range of 2-3 meters. Device must be portable and battery-powered. (cr2032)


Do you have such a device? How can we do this?

When the output power reduce to a minimum, how many meters is the signal area?

Thanks.