Clear and Pristine Sound Quality: With professional cardioid dynamic capsule, the system can reproduce more excellent, clear, pure and full sound and eliminate background noise and howling. Ideal for Karaoke, Home KTV, Big party, DJ, Wedding, Class use.    Enhanced Signal Stability: With unilateral 40adjustable frequencies per UHF mic and long transmission range in open space, ensuring that up to 40sets can be used simultaneously without worrying about interferences.    Sturdy and Durable Material: The all metal mic with steel mesh grille is particularly resistant to impact and corrosion. The receiver box has separate volume control for each wireless mic.    Easy to Operate: Just turn on the receiver and mics, they will match automatically. Note: It is not compatible with laptop, iPad, cellphone and AV receiver. 2 x AA batteries (included) are required for each mic.    What you get: 2 x handheld microphone, 1 x receiver, 2 x anti-slip ring, 1 x 6.35mm audio cable, 2 x mic covers, 1 x manual.