The OPT-AES option enables decoding and monitoring of 4 x AES3 id inputs. 1 AES3 id output. Software activation key. Other software activation keys can be purchased separately for the the following iAM Series products: IAM-MIX8; IAM-MIX16; IAM-AUDIO-1; IAM-AUDIO-2; IAM-VIDEO-2. So, in short, this software activation key opens the 75 ohm BNC AES3 id ports already installed on your iAM MIX8 or MIX16 as well as the IAM-AUDIO-1; IAM-AUDIO-2; IAM-VIDEO-2.