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Mobile User Guide > Using ICE Mobile > Transmitting
Transmitting
Use the Primary PTT button at the bottom of the Home page to transmit over selected channels.
Use the Channel PTT buttons in the channel panels to transmit over a single channel.
PTT Transmission Devices
ICE mobile supports a variety of hardware and software devices for triggering PTT. For information see Connecting PTT Devices.
To transmit over a single channel
1. Tap and hold the Channel PTT button.
Both the Channel and Primary PTT buttons pulse red during transmission as shown below:
*
*Channel PTT button
*A red circle with a white lightning bolt in the middle Description automatically generated
Primary PTT button
2. Speak into the microphone.
3. Release the Channel PTT button when done.

The PTT buttons return to their inactive state.
To transmit over multiple channels
1. In the Home page, use the channel selection box to select one or more channels for transmission. For example, in the following image, River Team A and River Team B are selected. Sector 8 is not.
2. Tap and hold the Primary PTT button at the bottom of the screen and speak into the microphone to transmit your message.

The Primary and selected Channel PTT buttons pulse red during transmission.
3. Release the Primary PTT button when done.