Single U-92A/U jack accepts standard U-174/U (TP-120) Helicopter Headset converting to ICOM right angle plug.
The second smaller plug is for the PA-50IC/PTT push-to-talk switch. If you don't add this unit you will have to push the PTT on the side of the ICOM radio to transmit.
You can find the PA-50IC/PTT here: PA-50IC/PTT
Product Weight 1.9 ounces (54
Shipping Weight 0.50
PilotUSA Helicopter Headset PA-82H Adapter ICOM A3, A6, A14, A22, A24 Transcvr