The transmitter allows you to choose between two power levels: low or high.
The case on the radio side has two holes to adjust the power with the help of a little special isolated screwdriver.
SA9 devices
In high power, the PRM can deliver up to 30W. Yet it is safer not to exceed the 25W recommanded by the manufacturer.
R578 : Low power
R581 : High power
[[File:A9_power_tunning.jpg]]