Proslogan IU Series Dual Wireless Microphone System (IU-2071) Designed in Germany, 2017 New fashion and three models are available. One handle+ one Lavalier, two handles or two Lavaliers. Unique Pilot-Technology to protect any kind of anti-interference, own design model popular in the world Infrared frequency synchronization automation function, Digital PLL circuit guarantees a reliable sound Adjusting built-in SQ to increase flexibility for the receivable distance Two Channels with infrared sync auto scan frequency system, easy for Plug-in-and-Play, Perfect for the not skillful person in use. Mute function, just Far more better for your live show, party, speach, singing, etc.