Mono transmitter only | Xlr and 1/4” combo jack | Durable metal housing stands up to the rigors of travel | Metal receiver tie-down link ensures a solid physical connection to the speaker or speaker stand | 16 digital channels to choose from allows multiple sets to be used at the same time without interference | Digital 900 MHz frequency range avoids television broadcasting interference | Rechargeable 18650 lithium Ion 1500mAh battery for up to 4 hours of use (can be extended with power bank - not included)