Different from normal Bluetooth connection, most car models are not recommended to connect to car Bluetooth. The recommended mode is to hold down the button (long press) and then power on, not to press the button once it is powered on. If you think the buttons can be adjusted, they should be small first and then , making it easy to insert and lift Material: PCB colour: As shown Package Contents: 1 x Bluetooth 4.2 Audio Transmitter Receiver Board version with microphone 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.