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.