RadioMaster 2.4GHz 4IN1 Multi Protocol Module - Fits Micro/Nano Transmitter SlotThe RadioMaster 4IN1 external nano module, which is a multi protocol module that integrates CC2500, NRF24L01, A7105 and CYRF6936 RF chips. This is external nano module can also be used on JR modules, with the included JR adapter. RM 4IN1 is compatible with more than 70 RF protocols, including DSMX, Flysky, SFHSS, HiTec, HoTT, OMP, Radiolink, Frsky and many more. The module features a +20dBm RF gain, a 2. 4GHz frequency band, and an operational voltage