<p>WM200 is a fixed frequency, it can't work at the same place & time. We have 5 group fixed frequency channel, sold on five different pages.</p><p>❤Any problem, please contact us</p> <p> ideal for church, various parties, conferences, happy karaoke nights, presentations and so on. </p> <p>   <b>Wireless Microphone System</b></p> <p>The wire-free design allows you to go further than you would with a wired microphone and without the cable trailing along the floor. It gives you a greater freedom of movement without getting tangled in the wire as you do so. This makes the microphone perfect for use when presenting to an audience.</p> <p>   <b>Working Distance</b></p> <p>The working distance of this product is about 150-200ft In the wide-open area</p> <p>***Note: Please take 5 minutes to find a channel that doesn’t have any interference. Especially for live events***</p> <p>   <b>4 x AA Batteries not Included</b></p> <p>life of battery is about 15 hours, if you don't use it for a long time, please remove the battery to avoid damage of the product. </p> <p><b>Caution</b></p> <p>1. You will need an extra audio equipment like speaker to connect with this product to make the sound working. </p> <p>2. Please keep the receiver away from the metal or any digital devices (such as computers, cellphones, etc.) to avoid potential sources of interference.</p> <p>3.The receiver should be more than 1m from the ground. Please avoid to be against a wall.</p> <p>4.Please do not use the microphone facing the receiver too closely, in order to avoid noise interference. </p> <p>5. Please do not flap the microphone head with hand, or it would be damaged.</p> <p> </p>