Radio control system
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ExpressLRS is a radio control system that is being developed by the community as an open-source project. It features a high packet update rate, providing impressive radio communication range. The system is available in two frequency bands, 2.4GHz and 900MHz. The project also allows users to build many receivers and transmitters themselves (as listed in the DIY device section).
Currently, ELRS performs comparably to alternatives such as Crossfire and FrSky R9m, matching their range and even surpassing them in some tests. It boasts leading packet exchange speeds among competing systems at this time.