The wireless FM transmitter is portable and convenient to use. It works very well in a large room or as the outdoor activities. It is very useful for teachers lecturers speakers and presenters. - Mode: WR-601 - Wireless microphone receiver and transmitter with 3.5mm type plug clips microphone - Steadying Performance good in sound especially convenient for use - Transmitter with belt clip for convenient to use - Frequency Range: FM 80-12500Hz - Output Impedance: 600ohm - Convenient to use with the clip - Transmitter powered by 1 x 6F22 battery (Included) - Receiver powered by 1 x AAA battery (Included) - Effective Distance: 10M - Suitable for teachers lecturers speakers and presenters