Bluetooth hands-free call: suitable for most Android mobile phones and other productsBluetooth connection: hands-free answering of incoming calls, making calls more convenient. No need to hold the phone, safer driving, Meet the needs of more peopleStylish, simple and elegant design, with high-end models to show noble atmosphereOne-piece injection molding body, compact structure and stylish shape.Support the detection of battery voltage and display alternately with frequency. Bluetooth wireless call, mobile phone navigation and amplification, mobile phone charging life, while navigating while listening to songs, while charging without interfering with each other. Specification: Interface type: dual usbApplicable models: GM modelsDisplay: digital tube displayPackage Include: 1 *Car usbIf you have any questions about the product, please contact me, we will contact you within 24 hours and give you a satisfactory answer.