2 in 1 Bluetooth 5.4 Transmitter and Receiver: SYENGKKY 3.5mm Aux audio adapter supports both Bluetooth transmitting and receiving, namely TX and RX Mode. TX mode: Bluetooth Transmitter connects non-Bluetooth audio sources such as airplanes, TVs to Bluetooth-enabled speakers, headphones via a 3.5 mm (AUX/RCA) cable. RX mode: Bluetooth receiver receives audio from a smartphone or other Bluetooth source device, then transmits the audio to car or home stereos, headphones via a 3.5mm AUX cable. | Stable Connection with Bluetooth 5.4 Technology: The Bluetooth wireless transmitter adopts the latest Bluetooth 5.4 technology, which can reduce power consumption and provide fast and stable transmission. The playing time of the wireless 3.5mm Bluetooth transmitter is up to 14 hours in RX mode and up to 11 hours in TX mode. Moreover, in both RX and TX modes, the Aux connector can pair with two Bluetooth devices simultaneously. | Easy to Use: This Bluetooth transmitter receiver adopts a simple plug-and-play design and is convenient to use. Just insert it into the auxiliary port of the device, then press and hold the multi-function button to turn on the power until the indicator light flashes (the indicator light is red in TX mode and blue in RX mode), connect the Bluetooth device, and you can enjoy wireless audio streaming. | Wide Compatibility: Bluetooth 3.5mm wireless transmitter can work well with devices that have a 3.5mm interface, such as TVs, car audio, home audio systems, headphones, audio music streaming systems, computers, planes, speakers, projectors, MP3 players, MP4 players, and so forth. | High-quality Stereo Sound: Using this Bluetooth adapter, you can get crystal-clear and high-quality stereo sound. Whether you're listening to music, watching a movie or making a phone call, you'll be able to experience outstanding sound quality. This is a must-have for long trips and flight travels | Easy to Carry: This small and lightweight Bluetooth transmitter is perfect for carrying around. You can put it in your pocket or bag without taking up much space. No matter if you are on a plane, in a car or at home, you can simply plug it in and enjoy audio content wirelessly.