This system combines cutting edge digital technology with tried and true Shure know how & quality. With not one but two rechargeable lithium Ion batteries with a 15 hour charge each and battery level indication on the receiver you are sure to have your presence felt and deliver your message with clarity for as long as it takes. A fact that we proved at a three day straight event. If you have to trust your equipment to perform lean on OTG Sound and we will deliver with superior products such as the Shure GLXD Digital Wireless Lavaler!