[2-in-1 Bluetooth Audio Adapter] Bluetooth audio transmitter has two usage modes: 1. In TX mode, the Bluetooth transmitter uses a 3.5mm (AUX/) cable to connect an audio source (TV/MP3 player) without Bluetooth functionality to speakers/headphones/hearing aids with built-in Bluetooth functionality. 2.In RX mode, the Bluetooth receiver can transmit audio from the smartphone to wired speakers/car audio input ports/headphones by receiving Bluetooth from the smartphone. [V5.4 Chip High Fidelity Audio] Bluetooth adapter, low latency technology provides clear, distortion free digital sound and low latency through devices that support , and is equipped with a Bluetooth V5.4 chip to achieve stable connections, wide signal range, fast transmission, and reduce power consumption. You just need to pair it with an audio source to start listening to your favorite music! [Wide Compatibility] Bluetooth transmitter receiver used in cars is compatible with most devices on the market, such as televisions, car stereos, home stereos, headphones, audio music streaming systems, speakers, PCs, MP3, and other devices. [Convenient To Carry&Practical] aux Bluetooth adapter for car adopt the latest and Bluetooth chips, and the ultra compact design will space. When you want to watch TV, your family or partner, and others want to sleep, this adapter can help you very well. [Dual Pairing Mode with LED display] Bluetooth Transmitter Receiver can be paired with two devices at the same time in TX/RX mode. There are two signal display lights on the display screen. When device A is successfully connected, signal light A will remain on. When device B is successfully connected, signal lights A and B will remain on, helping you solve the connection problem. [14 Hours Service Time] The charging time is about 2 hours(charging input requirements: 5V DC 300mA). It can be used continuously for 14 hours when fully . Colour:Gray black Material:plastic Package Contents: 1 x Bluetooth Transmitter Receiver 1 x USB 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.