Small size - big sound The WMS40 Mini wireless microphone system provides crystal clear sound and is a true plug'n'play solution. œUp and running in a second, it is the optimum wireless solution for small stages, clubs, places of worship, hotels, and gyms. 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.