2 Metal Dual UHF Wireless Cordless Microphone System Long Distance 16 Hours Use This is a pair of HS308L system, it comes with two different channels , so you have both to work at the same time.Microphone Sensitivity: 72dB, Directivity: Uni-Directional, Frequency Response: 100 to 10,000Hz, Output Impedance: 600ohm, Operating Voltage: 3V or 1.5 Volt DC, Effective distance: 15 to 30 meters, 50 to 100 feet, All of our instruments and microphones have a 1 Year Limited Warranty!. We are in direct contact with our manufacturer which makes our instruments a safe purchase for you.Important Note: The Receiver is tune-able, you have to tune the system to get the best reception, like to tune a FM radio station, Easy and Quick! Battery Not included.- EACH MICROPHONE IS ON A DIFFERENT FREQUENCY SO THEY CAN BE USED- This Microphone has an all aluminum body, with an on off and stand by switch- The transmitter has an approxamently, 2" long locking antenna- The receiver has an ON / OFF switch and is small approximately 2"x3"- This kit also includes a cable to use it as a wired Microphone, This Microphone also comes with a nice storage case that is foam lined