Upgrade 4-in-1 USB Bluetooth transmitter receiver: 4 modes - Bluetooth receive, Bluetooth transmit, PC transmit, and external sound card - are integrated into one Bluetooth transmitter, which can be switched with just one button. Discard cables and release audio: Connect audio from airplane entertainment, fitness equipment, gaming devices, cars, sound cards to wireless Bluetooth headphones, or stream audio from mobile phones, laptops, computers, CDs to your home/car speaker system. Low latency synchronous transmission: Low latency technology eliminates Bluetooth audio latency, achieving more stable audio transmission and synchronous video and audio transmission, allowing for both program enjoyment and privacy protection. Dual function application: USB and 3.5 audio jack can be used for audio transmission and can be applied to more audio devices. USB power supply does not need to worry about charging issues. Compact design, easy to carry: The size is only the same as a USB flash drive, making it easy to carry. Bluetooth 5.1 technology can achieve indoor positioning error within 1m and an accessible transmission distance of 10-20m. Please note when connecting to the TV: Both PC mode and TX mode can be connected to the TV. PC mode requires the TV's USB port to have the function of reading data. When switching to PC mode, you also need to double-click to activate it. To use it, the TX mode must be plugged into the audio cable. Color: Black Material: Plastic Packaging content: 1 Bluetooth receiver 1 x audio cable