【Handsfree Car Kit】*** Built-in microphone will automatically switches from music playing to hands-free talking when answering a phone call. answer/end/reject/redial a call or activate Siri/Google Now by clicking the multifunctional button. | 【Dual USB Ports & QC3.0 Fast Charge】*** SONRU Bluetooth radio fm transmitter has 2 USB ports for charging. The QC3.0 fast charging port is 5V/3A, up to 4x faster charging speed then the conventional car charger. The another USB port is 5V/1A, can read music files in U disk, such as MP3, WMA, WAV format. | 【3 Music Play Modes】*** Supports Bluetooth play, microSD card play (up to 32GB), USB flash drive play (up to 32GB). Attention: to avoid any noise, please remember to adjust the frequency of the fm transmitter just the same as it on the car radio (Choose a blank radio station to avoid signal interference) | 【Crystal Clear Sound】*** Newest Bluetooth V5.0 car radio adapter and CVC noise cancellation technology ensure that the fm transmitter can connect to your devices more quickly and consistently, bringing you CD-like sound quality. | 【LED Voltmeter Display & 7 Color Lights Changing】*** The car voltage will be displayed when the FM transmitter is inserted into the car cigarette lighter. The last paired phone can be automatically connected due to the memory function. In addition, the colorful led light can be switched by 7 different colors or enter into breathing lighting mode.