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The Digi-Wave™ system is a digital spread-spectrum (DSS), simultaneous two-way wireless listening system. Using it’s frequency-hopping algorithm, it avoids interference and is a very secure method of communication. The Digi-Wave communication system allows users to listen and talk to one another wirelessly in a variety of scenarios. Great for use during training, presentations and tours, especially in houses of worship, classrooms, and healthcare facilities. The DLR 400 ALK uses alkaline batteries. If a rechargeable version is preferred, see the DLR 400 RCH.