Here are the recommended audio settings on the Prism:
Bluetooth Audio - On
Internal Microphone Gain - High
Ultra HD Audio Mode - On
Internal Microphone Auto Mute - On
Sena recommends to have the Bluetooth Audio Recording feature turned “On”, the internal microphone gain set to “High” and the Internal Microphone Auto Mute turned “On”. With this configuration, whenever a Bluetooth headset is connected to the Prism for recording audio from the headset’s microphone then the internal microphone on the Prism will automatically be disabled. If a person does not want to record audio from a Bluetooth headset then Prism will record outside audio through the internal microphone because the internal microphone gain is set to “High”.