Communicate wirelessly at distances up to 150 feet using this Wireless Microphone System from Monoprice.This 2.4GHz Wireless Microphone System is designed to allow for wireless, two-way communications at distances up to 150 feet. It can be used for personal communications, as well as serving as an audio source for video recording. Applications include use by stage hands, security, wedding coordinators, restaurant staff, warehouse staff, and video recording.The receiver and transmitter are each powered using two AA batteries (not included). The receiver has the facility of outputting the audio received from the transmitter without including the audio broadcast from the receiver, so you give directions to your audio engineer during recordings.