Versatile and feature-rich digital wireless system for those who sing, speak or play instruments that allows for seamless product pairing and management via the EW-D Smart Assist App. Receive state-of-the-art live sound. Features: Digital transmission operating in the UHF spectrum greatly enhances range, reliability and scalability, Smart Assist App connects via Bluetooth Low Energy for a streamlined setup and operation at a distance, Auto scan creates reliable connections with minimal time and effort, 134 dB audio input dynamic range eliminates need for sensitivity adjustments and preserves every detail, Elimination of intermodulation enables channels to be placed in an equidistant tuning grid 600 kHz apart, 56 MHz of tuning bandwidth and equidistant spacing enables up to 90 channels, 2,240 selectable frequencies allow for fine tuning, Lithium-Ion battery pack (sold separately) delivers up to 12 hours of operation (up to 8 hours of operation with 2x provided AA batteries)