This Extremely Portable, Lightweight Wireless Audio Transmitter Receiver Is An Ideal Wireless Audio Solution For A Wide Range Of Situations And Uses.transmitter Mode:wireless Streams Audio From Your Non-bluetooth Tv, Home Stereo System.receiver Mode: Wireless Streams Audio From Your Bluetooth-enabled Phone, Tablet, Or Computer To Your Wired Stereo, Speakers, Or Headphones.this Aux - Bluetooth - Usb Dongle Can Read Data From Usb Port (depends On The Device). If Usb Port Does Not Work, Please Use The Aux Cable Instead.mode Switching:simply Click The Button.because The Product Needs To Read Data When It Is Turned On, If You Need To Change The Mode, Please Wait For 1-2 Seconds, And Do Not Press The Switch Quickly.pairing Method:rx Mode: Pairing Name: M135, Find M135 In The Bluetooth Settings Of The Phone To Pair. The Blue Light Flashes During The Pairing Process, And The Blue Light Stops Flashing After The Pairing Is Successful. Connect The Product To The Audio Device With A 3.5 Audio Cable.tx Mode:tx Mode Will Automatically Search For Other Bluetooth Receiving Devices (such As Bluetooth Headset, Bluetooth Speaker, Bluetooth Receiver, Etc.), The Red Light Flashes During Pairing, And The Red Light Stops Flashing After Pairing Succeeds. Connect The Product To A Device Such As A Tv With A 3.5 Audio Cable/rca Audio Cable.