Radiomaster 2.4GHz RM 4 IN 1 ModuleThe RadioMaster 4IN1 external module is a multi protocol module that integrates CC2500, NRF24L01, A7105 and CYRF6936 RF chips. Designed for OpenTX and EdgeTX systems, the RM 4IN1 module allows the radio to connect with most mainstream protocols on the market Package Includes: 1x 2. 4GHZ 4IN1 Module 1x Antenna Features: Up to 20dBm power output Compatible with more than 70 RF Protocols Wireless trainer function For Zorro, Boxer, TX16S MKII, TX12 MKII