Excellent Audio PerformanceWireless microphone utilizes the latest wireless transmission technology for a stable and fast connection. Equipped with professional cardioid pointing to maximize gain before feedback and minimize noise at the premises for high fidelity sound quality. The receiver has a built-in rechargeable battery that can support up to 10 hours of use after a 4-hour charge. Plug and PlayThrough the 6.35/3.5mm wireless karaoke microphone jack, you can connect the receiver to speakers, jukeboxes, audio amplifiers, PA systems, mixers, megaphones, and other audio devices (Note: Only for audio devices with 6.35mm or 3.5mm jacks), please note that this system is not compatible with cell phones, Bluetooth speakers, computers or tablets. Frequency Adjustable,RechargeableEach professional microphone for singing has 8 adjustable channels to avoid radio interference. Each wireless handheld microphone has two independent volume control buttons (VOL + and VOL -). The butto