Unfortunately, the ADI-250 cannot be set to a different frequency. 

The transmitter and receiver work with a unique code that is created by the set itself. 

There are a million different codes, so if you buy several sets, the chance that they will interfere with each other is 1 in a million.

Should you have any further questions, you can always contact us via this website.

Please state the question or complaint clearly, so that we can provide you with the best possible service.