Dedicated Service: 4 x Handheld Microphone, 1 x Receiver, 1 x Power Supply, 1 x User Manual. If your microphone has no sound, please make sure your microphone and receiver have enough power. We provide 1 year warranty and free replacement service. Please feel free to contact us when there is a product quality issue or any other problem. Your email will be answered within 24 hours. Rugged Materia: Plastic microphone housing with metal mesh head and metal connectors for extra impact and corrosion resistance Receiver with four XLR outputs and one 1/4'' audio output jack for plug-and-play, easy setup, and individual volume control for each wireless microphone. UHF microphone system with voice compression and expansion technology, microphone with anti-vibration ring, easy to use, powerful and stable performance. Exceeds Expectations in Wireless Performance: MicrocKing wireless microphone system provides superb signal stability, eliminating radio interference and simplifying your preparation. With a professional receiver featuring an LCD display showing frequency numbers and individual volume controls for precise vocal balance, the MK240-1 wireless microphone system is the perfect choice for music lovers and sound engineers who want credible, pristine sound. Clear and pure sound quality: High-quality cardioid moving coil pickup head designed to limit feedback and interference, 4-channel wireless microphone set with fixed frequency design has superb signal stability and eliminates unwanted distortion. The microphone has a built-in high-quality chip to provide clear, smooth and optimal real sound. MicrocKing System: Rugged, metal build, kit with 4 UHF wireless handheld microphones and a 4-channel wireless receiver for high volume use. It allows up to 40 systems to be used simultaneously in a total of 4x40 channels for small outdoor performances, conference rooms, classrooms, bars, dance halls, KTV rooms and complex high-end professional concert environments to achieve satisfactory results.