The AKG WMS40 Mini wireless microphone system provides crystal clear sound and is a true plug'n'play solution.The system is available in different application optimized set packages, all of which includes a universal, switched mode power supply for worldwide operation. The WMS40 Mini system stands out for its extremely long battery life of 30 hours with a single AA battery which helps saving money in the long run. The WMS40 Mini system's new frequency options include US25A 537.500 MHz, US25B 537.900 MHz, US25C 539.300 MHz, US25D 540.400 MHz. The dual-band WMS40 Mini2, meanwhile, addresses the combined frequency bands US25A/C and US25B/D.