?Infrared Frequency Matching? First, set the frequency on the receiver. Then align the infrared frequency pairing point of the microphone with the IR point of the main unit, press SET, and wait a few seconds. When it completes pairing, the microphone signal and microphone volume will be displayed on the screen. ?What You Get 1 x Receiver; 2 x Wireless Microphones; 2 x Antenna; 1 x 6.35mm Audio Cable; 1 x 6.35mm to 3.5mm Adapter; 1 x Power Adapter; 4 x “AA” battery; 1 x User Manual; 2 x Microphone Sponge; 2 x Microphone Anti-Rolling Ring. And all LiNKFOR products come with 18-month warranty. ?Clear Sound & Long Range 328ft?Dual antenna reception, stronger and more stable signal. Built-in high-density filter sponge, effectively filter noise. With an ultra-long range of 165~328 feet, the microphone system is an ideal choice for church, outdoor wedding, home entertainment, small DJ KJ stage, birthday party, conference, classroom and so on. ?NOTICE? 1) Please connect your speakers with the MIC interface. 2) The microphoe can not be rechargeable, which is operated by 2 “AA” size batteris. And the included batteries are only for test, please change a new one when you start to use the microphone. 3) When one od the microphone can not be connected, please try to change a defferent frequency. ?Professional UHF Wireless Microphone System?The microphone system provides 2*100 groups of frequency adjustment to ensure reliable performance without interference. With a 6.35mm audio output and balanced output, the microphone system is compatible with your audio mixer, sound card, amplifier or speakers.