4-CHANNEL WIRELESS MICROPHONE SYSTEM ZERFUN MU-898 UHF Wireless Microphone System that comes with four integrated handheld metal cardioid microphones and metal receiver box with with Independent Volume Control ECHO Bluetooth. This system also featured with automatic frequency scanning and automatic transmitter setup for easy synchonization between transmitter and receiver. Perfect for home karaoke, meeting, party, church, DJ, wedding, and much more. METAL RECEIVER BOX WITH INDEPENDENT VOLUME CONTROL ECHO BLUETOOTH The devices and the chassis for the receiver are made from metal. Receiver Box has one Mic Input and Mic Vol Control for Wired Microphone Wireless Mic-A Mic-B Mic-C Mic-D Independent Volume Control Microphone Adjustable ECHO Function Bluetooth Function to use Receiver Box as a Bluetooth Receiver to play background music Turn on your device 39 s Bluetooth, search 34 X168 34 and connect BT Range about 32 Feet . INPUT ①1 4 Wired Mic Input ②1 8 34 3.5mm Audio Input ③Bluetooth Input Turn on your device 39 s Bluetooth, search 34 X168 34 and connect . OUTPUT ①1 8 34 3.5mm Audio Output ②1 4 34 6.35mm Audio Output. TRANSMISSION RANGE The ZERFUN MU-898 Wireless Microphone System can support up to 200 feet range, 50 compatible frequencies on each channel 4 X 50 for interference-free reception. The UHF frequencies range within 500 - 599 MHz, are compliant with the FCC regulations. NOTE When work with 2 sets or more simultaneously, please make sure microphones are set with different channels. If multiple systems are being used, increase the frequency separation between systems. BATTERY INFO Each microphone use 2 x AA batteries Batteries Not Include that last Up to 7-8 hours of continuous use from fresh AA batteries. ZERFUN Wireless Microphones are well-made cardioid wireless mics which means they pick up noise unidirectionally Only when we speak towards the top of the microphone will there be a sound, while there will be no sound when speaking on the side . With this pickup pattern, the directional vocals are easy to isolate from background noise. Each microphone channel in this system has an individual volume control. PACKAGE LIST ZERFUN Wireless Microphone x 4 MU-898 Receiver Box x 1 Power Adapter x 1 6.35mm to 6.35mm Cable x 1 3.5mm to 3.5mm Cable x 1 Audio Cable x 1 Microphone Windscreen x 4 Antiskid Ring x 4 User Manual x 1. Genuine ZERFUN Wireless Microphone products come with supportive 24-Hours After-Sales Customer Service, 12-month Manufacturer Assurance.