KN330 3 in 1 USB Bluetooth 5.0 Adapter Audio Transmitter Receiver with Switch Button & 3.5mm AUX Interface Features: 1. It can help home speakers, wired earphones, car speakers, etc., do not have Bluetooth to connect with your mobile phone via Bluetooth 2. When using it on a computer, there is no need for an audio cable, no driver, plug and play (only audio cannot transmit data) 3. With a switch, you can switch between transmitting mode and receiving mode at any time, both modes are two-channel stereo 4. The 3.5mm AUX interface needs to be connected to an audio cable to play music 5. Built-in microphone, support Bluetooth hands-free call 6. No built-in battery, powered by USB DC 5V interface, support multiple power supply methods 7. Bluetooth 5.0 technology, fast transmission speed 8. Small size, easy to carry Product specifications: 1. Bluetooth version: Bluetooth 5.0 2. Operating range: up to 10m (under no obstructing objects) 3. Pairing name: KN330 (in receiving mode) 4. TX mode: Transmitter mode, the red LED light is on 5. RX mode: receiver mode, the blue LED light is on 6. Product size: 45x20x11mm Packing list: Bluetooth audio receiver transmitter x 1 3.5mm male to male audio cable x 1 Manual x 1