Features: Hands-free calling, Low latency, Built-in microphone, Fast charging Brand: SOARUN Connectivity Technology: AUX, Bluetooth, HDMI, USB Material: Metal Product Dimensions: 10.6 cm length x 6.5 cm width x 4.5 cm height Color: Black [Latest Bluetooth 5.3 | Use 2 Devices Simultaneously] The FM transmitter is equipped with the latest Bluetooth 5.3, providing a more stable and faster connection. The communication speed of the Bluetooth 5.3 FM transmitter is 4 times faster, optimizing transfer delay and connection error issues. Our fm transmitter bluetooth car has dual-port simultaneous charging (PD 36W + QC 3.0 18W), achieving fast charging about 5 times faster than conventional chargers. [FM/AUX Mode] The fm transmitter bluetooth car can be easily used in the car with two connection methods: 1. FM: Turn on the car radio and adjust the device to the same blank frequency channel as the car radio. 2. Use as a Bluetooth receiver: If your car has a 3.5mm jack, simply connect with a 3.5mm AUX cable (included), and the car FM Bluetooth transmitter will play directly through the car with true zero-distortion sound quality. The transmitter can play directly through the car with true zero-distortion sound quality. [Hands-free Calling, CVC Noise Reduction Technology] The FM cigarette lighter usb has a built-in microphone and is compatible with Siri and Google Assistant, using CVC noise reduction technology to achieve full-duplex sound quality and enable hands-free calling, as well as voice navigation broadcasts. The FM broadcast frequency range from 87.5MHz to 108.0MHz is wider than that of general transmitters. It supports smart voice navigation on mobile phones, allowing you to enjoy one-touch hands-free calls, and easily answer, reject, and redial calls.