The Audio Technica Professional VHF Wireless Lavaliere And Hand Held Camcorder Microphone System is a multipurpose wireless microphone system. It can be used for videos, performances, karaoke, DJs, houses of worship, schools, meetings and presentations. This system features two microphones: the ATR35 omni-directional condenser lavaliere microphone and the ATR20 unidirectional dynamic vocal/instrument microphone. The ultra-lightweight and compact transmitter and receiver are each powered by a single nine-volt battery.