Wireless freedom with all the quality of a cabled connection. The AKG WMS470 Instrument Set Wireless System is an ideal wireless solution with professional features to help you achieve high quality sound in any venue. As long as you can keep performing the Instrument Set can too. The transmitter can run for up to 14 hours on one high quality AA battery. Your sound doesnt have to suffer from difficult rooms. Rehearsal mode lets you soundcheck a room by monitoring for and recording dropouts to identify dead spots. An inaudible pilot tone is also included to prevent unwanted start up noise and transmit battery status data from the transmitter to the receiver.