DEVOTED SERVICE: Genuine Phenyx Pro audio products come with 12-month manufacturer assurance and supportive customer service. Welcome to come to us for troubleshooting or replacement of discontinuous/defective parts. BOX CONTENT: 1 x UHF wireless receiver, 4 x handheld wireless microphone, 1 x user manual, 1 x power adapter, 1 x 1/4’’ audio cable, 1 x 6.35mm to 3.5mm adapter, 4 x anti-rolling ring, 8 x AA battery, 4 x rubber feet, 2 x Antennas. STABLE WIRELESS PERFORMANCE: High quality cardioid capsule and improved circuitry design of this microphone wireless system can capture sound and transmit smoothly without dropouts, hiss, or feedback, delivering robust, clean, and stable sound quality, The karaoke microphone wireless is ideal for applications like church, weddings, public speaking, instruction, conference, and outdoor events. ?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. STURDY BUILD WITH DETAILS:Metal 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.