Reasoning
Across the primary listing (Pyrodrone), the DJI O4 Air Unit Pro appears repeatedly and overwhelmingly as the VTX type, with occasional mentions of the non-Pro variant. A separate source references DJI O3, which does not align with the O4 Pro option and is outvoted by the O4 Pro terminology. Therefore, the canonical value reflecting consensus is 'DJI O4 Air Unit Pro'.