Pro9 Headset: 1 - Operating frequency

Pro9 Headset: 2 - Channels

Pro9 Headset: 3 - Channel activation

Pro9 Headset: 4 - Paging

Pro9 Headset: 5 - LEDs

Pro9 Headset: 6 - Volume adjustment

Pro9 Headset: 7 - Noise cancelling

Pro9 Headset: 8 - Sleep mode

Pro9 Headset: 9 - Registration

Pro9 Headset: 10 - Battery

Pro9 Headset: 11 - Audio prompts

Pro9 Headset: 12 - Weight

Pro9 Headset: 13 - Approvals