This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses.Transmitter mode: wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your bluetooth-compatible headphones or speakersReceiver mode: wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphonesMode switching: you can switch modes by switching the TX/RX switch.Pairing MethodRX mode: pairing name: ZF-169, find it in the bluetooth-compatible 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-compatible receiving devices (such as bluetooth-compatible headset, bluetooth-compatible speaker, bluetooth-compatible 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.USB adapter mode: wirelessly transfer audio from the PC to bluetooth-compatible headset or speaker through USB port, no audio cable is required.Item Name: bluetooth-compatible Transmitter ReceiverMaterial: PlasticBluetooth: 5.0Features: Mini, Easy to Use, Audio Transmitter ReceiverSize: 3.1cm x 1.6cm x 0.7cm/1.22" x 0.63" x 0.28" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Transmitter Receiver