Full Details from Amazon.com : http://www.amazon.com/gp/product/B000PK31LU?tag=onigi-20
Audio-Technica PRO88W Wireless Cardioid Clip-on Microphone System (W88-13-829)
Two switchable frequencies for interference-free operation
High-band VHF operation for superior sound
Normal operating range 100 up to 300 under optimum conditions
Durable flexible antenna can be positioned for best reception
Includes AT829mW miniature cardioid clip-on microphone
