Product Name: 3 in 1 USB Bluetooth Adapter Product Color: Black/White Bluetooth Version: 5.0 Transmitter Mode: Red LED Light On Receiver Mode: Blue LED Light On Product Features: Product Usage: 1. This portable, lightweight wireless audio transmitter and receiver is an ideal wireless audio solution for a variety of situations and uses 2. Transmitter Mode: Wirelessly transmit audio from a non-Bluetooth TV, home stereo system or CD player to Bluetooth headphones or speakers 3. Receiver Mode: Wirelessly transmit audio from a Bluetooth-enabled phone, tablet or computer to a wired stereo, speaker or headphones 4. Mode Switching: If the device is in a certain mode for a long time, you need to re-power it twice to switch to another mode. If the device has just switched modes and you want to switch to another mode immediately, you only need to re-activate it once. 5. Pairing Method Receiver Mode: Pairing Name: ZF-169, find ZF-319 pairing in the Bluetooth settings of the mobile phone. The blue light flashes during pairing, and the blue light stops flashing after pairing is successful. Use a 3.5 audio cable to connect the product to the audio device. Transmit mode: Transmit mode will automatically search for other Bluetooth receiving devices (such as Bluetooth headsets, Bluetooth speakers, Bluetooth receivers, etc.), the red light flashes when pairing, and the red light stops flashing after pairing is successful. Use 3.5 audio cable/RCA audio cable to connect the product to TV and other devices 6. Wide compatibility Equipped with 3.5mm cable, this receiver transmitter adapter can be widely used in your computer, laptop, home stereo system, headphones, smart phones, MP3 players, CD players, etc. Product gross weight: 40g Packing method: boxed Packing size: 7*7*2cm Packaging includes: adapter*1 3.5mm audio cable*1