- CC2500 LBT Version (Europe) is limited to LBT compliant protocols FrSKY X/X2 LBT & HoTT LBT
- 4in1 LBT Version (Europe) is limited to LBT compliant protocols FrSKY X/X2 LBT, HoTT LBT and DSMX
- ELRS LBT (Europe) Version is pre-installed with ExpressLRS CE EU domain LBT FW (Limited to 100mw power output)