With some of teh speakers, the channel is not changing when you use the application.
This can be fixed via either sending it back to us to let us do this step or you could try this too.
1. After opening up the speaker you will see this board with the green arrow
2. Turn on the speaker/horn so it is powered up
3. The process is to "hot wire" the communication chip so that it remains power up while the USB is plugged in so that when you send the new channel it can write this to the comms chip.
So by using some fine pointed tweezers or a paper clip or something else you can easily manage, connect these two points together and keep them connected while you press the program button in the application.
4. Now you should be able to test your channel selection with your matching LED Flasher/transmitter unit.