STURDY BUILD WITH DETAILS: Metal UHF wireless receiver and microphones are designed to last, suitable for heavy use. The wireless karaoke microphone system includes AA batteries for your convenience. Additionally, the dual cordless microphone set also comes with 2 anti-rolling rings to color-code your handheld microphones 30 TUNABLE FREQUENCY GROUPS: State-of-the-art circuitry designs 30 tunable frequency groups for this microfono inalambrico set in 500MHz band, allowing up to 3 units to use at the same time without interference. You can also enjoy the freedom of changing frequency if preset frequency failed. Operating distance is up to 200ft in open space line of sight STABLE SUPERIOR SOUND: The wireless DJ microphone system, with its cardioid capsule and enhanced circuitry, ensures smooth sound transmission without dropouts, hiss, or feedback, delivering clean and stable audio quality. The karaoke microphone wireless is suitable for applications like karaoke, live performances,