Multiple devices are plug-and-play, and are compatible with AUX audio ports. Newly upgraded Bluetooth 5.3, DSP technology and A2DP dual-core processor, fast response speed, low power consumption and stable transmission. Receiving mode, receive Bluetooth signals, and output to speakers/headphones and other devices through AUX audio. One-touch hands-free calling, when Bluetooth is connected, you can talk freely and say goodbye to the danger of answering the phone while driving, making driving safer. Transformed into a Bluetooth speaker, after the mobile phone Bluetooth is paired, connect the AUX audio jack to the speaker without Bluetooth function to transform into a Bluetooth speaker. Color: As shown Material: ABS Package Contents: 1 x Bluetooth Transmitter Receiver 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.