1.universal wireless system: record crystal-clear, distortion-free audio from your dslr, camcorder, smartphone, or tablet. perfect for filmmakers, vloggers, mobile journalists, and content creators,2.reliable audio: features an upgraded rf,using uhf frequency band, with 30 selectable channels for interference-free operation, wireless range up to 50m(165ft).3.easy to use: plug and play, no further action. please turn on the transmitter and receiver power switches, you can use it 4.wireless headset & lavalier:lapel clips design for attaching them to clothes,which make it easy for you to move.signal is transmitted stably, giving you a great sound effect. 5.convenient: listen to your audio in realtime with the headphone input to ensure accurate sound recording. for more control, adjust the microphone volume to reduce time in post-production.