1. FULL COLOR USER INTERFACE DESIGN: FM transmitter bluetooth has the largest 2.0 LCD screen which shows all function setting, plus 360rotatable goose neck design, more simple & free for you to operate. 2. THE MOST ADVANCED FUNCTION OF WAKING UP CELLPHONE VOICE ASSISTANT: through the voice dialogue, you can make calls, music playback, navigation, etc anytime. Besides, the CVC technology and built-in microphone feature of car bluetooth adapter supports high clear hands-free calling quality. 3. QC 3.0 QUICK CHARGE: The bluetooth FM transmitter comes with 2USB ports, two fast charging USB ports support QC3.0 and 5V /2.5A, which can quick charge two devices simultaneously, the other one is used for USB music playback. 4. UNIQUE EQ MODES CUSTOMIZED: The FM transmitter supports 4 music play modes AUX/ BLUETOOTH/ USB/ TF CARD, also you can customize music from USB drive and TF card to normal, rock, popular, classical, jazz, and country EQ style. With A2DP function and anti- statics technology, create full duplex sound quality, grants you lossless music in car. 5. SAFETY FUNCTIONS & PROFESSIONAL SERVICE SUPPORT: FM transmitter for car equipped with a voltmeter to show you the condition of your car battery. (Normal value should be between 12 ~ 14.8V, 13.2V ~ 14.7V when you start the engine, 12.2V ~ 12.8V when your car ignition is off).