IMPORTANT NOTE.
This system comprises of three transmitters, two handheld microphones and one headset microphone, and a dual two channel receiver. As the receiver is dual channel then you can only use two transmitters at the same time.
Options are:
1. Two handheld microphones together.
2. One handheld microphone and one headset microphone together.
You can of course also just use one handheld microphone or one headset microphone as you do not have to use both channels, you can simply use one if only one is required.
//