VocoPro VHF33084 Vocal Dynamic Microphone, Omni Sparkling crystals on mics give a dramatic look New single chip microphone circuit design offers greater system reliability than traditional crystal design Pilot tone technology prevents interference from other wireless devices New AA battery design doubles operating time compared to 9V Includes rechargeable AA batteries (can also run on non rechargeable batteries) Auto-mute circuitry provides noiseless on/off switching Use one or two 1/4" outputs for mixed or separate signal output for greater flexibility**