Setting Beacon Maximum Region Detection

Hello, i have a question about how to set specific maximum region detection for each beacon ( e.g. Blueberry Beacon Maximum Region Monitoring is 4 meter only)

i am using CLLocation in iOS for detecting whether i already entering or exiting a region. But, from resources that i already read, we can setting these region with sliding the Transmit Power (dBM) (?)

is there any way to set this max region??