Packing content: 2 x handheld microphones, 1 x receiver, 1 x power adapter, 4 x AA batteries, 1 x 6.35mm audio cable, 2 x anti-rolling ring, 2 x mic covers, 1 x manual. Easy to Operate: Plug and play, no need app or configuration, easy to use. Power: The microphone is powered by 2 x AA batteries, offering you great freedom of movement on stage or in the room. Battery life is about 10-16 hours continuous use. The receiver is powered by DC 12V adapter (Power adapter included). Wide compatibility: Compatible with audio devices that have 1/4" mic inputs like PA speaker, audio mixer, amplifiers and karaoke machines . NOT compatible with laptop, iPad, cellphone, AV receiver, TV or Soundbars. Invididual microphone volume control: The receiver box has separate volume control and LCD screen for each wireless mic. You can see the working frequency and volume level for each mic in the LCD screen. Sturdy and Durable Material: Both the receiver and the microphones are made of aluminium, light weight yet sturdy. Enhanced Signal Stability: With 32 adjustable frequencies per UHF mic and long transmission range (240 feet) in open space, ensuring that up to 32 sets can be used simultaneously without worrying about interferences. 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.