A range of over 250" makes the Nady E03 in-ear personal monitor system suitable for playing small clubs or large theaters. Includes earbuds, one wireless transmitter, one portable, pocket-sized receiver operating on one of eight factory-switchable channels that won"t interfere with VHF or UHF mics on the same stage. One transmitter can provide audio mix for any number of stage performers on the same channel. Powered by a 9V alkaline or rechargeable battery.