AKG WMS470-D5-8 Professional Multi-Channel Wireless Microphone System 570.1 to 600.5 MHzHaving a Band 8 frequency range on the WMS 470 means operating between 570. 1 to 600. 5 MHz to ensure higher end frequencies can be crystal clear through the use of its included D5 dynamic microphone. Compatible with WMS4000 accessories For multichannel systems in critical environments. Up to 14 hours operation with one single battery Lowest operating costs using AA size lithium dry battery. Pilot tone transmission For transmitter battery status