The AKG WMS40 Mini I ISM1 Wireless Instrument System. Small size – big sound for houses of worship, hotels, gyms and band applicationsThe WMS40 Mini wireless microphone system provides crystal clear sound and is a true plug’n’play solution. Up 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.