Plug and play, no need pair.No need to buy batteries! The receiving box adopts 6.35mm audio head, which can be directly plugged into any audio (especially perfect for Karaoke, Speech, Meeting, Performance, Indoor or Outdoor. Design for Outdoor Karaoke Speaker, PA Speaker System, Power Amplifier, etc), no need to connect the output line separately.( NOT for Bluetooth Speakers/PC/Phones)