1. Bluetooth Transmitter Receiver - ① Transmitter mode: transmit audio from non-Bluetooth audio sources (TV, PC, CD / DVD player, etc.) to Bluetooth headphones / speakers via 3.5mm audio cable. ② Receiver mode: transmit audio from Bluetooth audio sources (smart phone, tablet, Bluetooth TV/PC) to non-Bluetooth headphones / speakers / car / home sound system via 3.5mm audio cables. | 2. USB Audio Transmission - ① Transmitter mode: wirelessly transmit audio from non-Bluetooth PC / PS4 game console to Bluetooth headphones / speakers via USB port. ② Receiver mode: non-Bluetooth speakers with USB ports can receive audio via USB port now. No 3.5mm audio cable/driver required. | 3. One Button Switch Mode - Simply press a button to quickly switch transmitter / receiver mode. After the Bluetooth adapter is powered on, red light in TX - Transmitter mode, blue light in RX - Receiver mode. | 4. USB Power Supply - USB has power function. When in use, it must be powered by power device with USB port (such as AC adapter, car charger, laptop). As long as the Bluetooth audio adapter connected with power, you will never worry it will run out of power while listening to music. | 5. Bluetooth Everywhere - The wireless connection with various Bluetooth devices is achieved by connecting the adapter to non-Bluetooth devices. And achieve a connection range of up to 33ft/10m (barrier-free). In TX mode, turn non-Bluetooth TV, PC, CD player, iPod, MP3 / MP4 into Bluetooth. RX mode: turn non-Bluetooth home or vehicle music streaming sound system into Bluetooth.