1. Connect the rx receiver to the mobile device with the phone cable, connect the camera video/audio/sound card/mixer and other devices with 3.5mm/6.35 audio jack with the camera cable. 2. Press the rx receiver switch key and turn on the power switch. 3. When the rx receiver indicator light is green, the receiver is in standby mode, and the connection between the rx receiver and the tx transmitter is normal. Name: Lavalier Wireless Microphone Applicable objects: home, computer, recording Colour:Black Material:plastic type:B: 1 to 1 Package Contents: 1 x Transmitter 1 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.