The Shure GLXD16+ is a digital wireless guitar system that offers reliable performance and outstanding sound quality in a package that's simple to use, even if you've never operated a wireless system before. Shure's next-generation technology handles the set up for you, automatically scanning both the 2.4 and 5.8 GHz frequency ranges to seek out the best possible digital transmission channel to ensure dependable performance for your application at a typical range of up to 100' indoors and 65' outside.