UPGRADE 4-IN-1 USB BLUETOOTH TRANSMITTER RECEIVER: Integrates 4 kinds of modes - Bluetooth receiving, Bluetooth transmitting, PC transmitting, and external sound card - in 1 Bluetooth transmitter, switching is possible with one button. THROW AWAY THE CABLES, FREES THE AUDIO: Either connect audio from TVs, airplane entertainment, fitness equipment, gaming equipment, cars, sound card to wireless Bluetooth headphones or stream audio from cell phones, laptop, computers, CD's to your home/car speaker system. SYNCHRONIZED TRANSMISSION WITH LOW-LATENCY: APTX low-latency technology eliminates Bluetooth audio latency for more stable audio transmissions, enabling synchronized video and audio transmission for both program enjoyment and privacy protection. DUAL-FUNCTION FOR WIDER APPLICATION: USB and 3.5 audio jack can be used for audio transmission, which can be applied to more audio devices, and USB power supply without worrying about charging problems. COMPACT DESIGN FOR EASY CARRYING: The size is only the same size as USB flash disk, easy to carry around, Bluetooth 5.1 technology can realize indoor positioning error within 1m, transmission distance in the absence of obstacles 10-20M meters. CONNECTING TO TV PLEASE NOTE: Both PC mode and TX mode can be connected to TV, PC mode requires your TV's USB port to have the function of reading data, and when switching to PC mode you also need to double-click to activate it.TX mode must be plugged into the audio cable to be able to use it. Colour:black Material:plastic Package Contents: 1 x Bluetooth Receiver 1 x Audio Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.