STURDY BUILD WITH DETAILSMetal UHF cordless microphone receiver and UHF handheld microphones are designed to last, suitable for heavy use. Each wireless microphone comes with anti-rolling rings for better protection and color coding. AA batteries are also included for your convenience 25 ADJUSTABLE FREQUENCY: State-of-the-art circuitry designs 25 adjustable frequency sets for this microfono inalambrico set in 500MHz band, allowing up to 25 units to use at the same time without interference. You can also enjoy the freedom of changing frequency if preset frequency failed. Operation distance is up to 200ft in open space line of sight STABLE SUPERIOR SOUND: The 4 channel 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, church services, and outdoor