Features: Internal Multi-protocol RF: The TX16S internal RF system features the CC2500, NRF24L01, A7105 and CYRF6936 RF Chip modules all integrated on one board. This module most of today\'s prominent RF protocols(See RF Chip data below). The Radiomaster in-ternal RF module will support firmware updates directly from the radios Operating system. Opentx Supported: Radiomaster has worked in collaboration with Opentx to bring the TX16S into the market and will continue to work with Opentx to provide support to the project and ensure the concepts of open standards are carried forward today and in the future. External Module Bay: The TX16S natively supports Team Black Sheep Microtx modules in Crsf mode with LUA scripts. Best of all the TX16S Internal 4-in-1 Multi-protocol module allows you to keep the Microtx installed and switch between internal RF and Crossfire via software, no more module swapping. Convenient Charging: The TX16S features built in USB-C charging with a 2s Battery Management System to balance charge 7.4V Li-ion or Li-poly batteries. Our built in charger features over current protection and temperature sensors to ensure safe charging. Warranty: If there are any problems, please contact our store in time. We will give you a satisfactory solution.