Talk hands-free: Connect the FM transmitter to your car using Bluetooth and make your driving even safer. Hold the button for two seconds to activate the voice assistant Siri/Google Assistant, which can help you make and receive calls, play music and control navigation. It supports both compatible with iPhone and Android systems. Listen wirelessly in the car: Use the transmitter to listen to music in the car via Bluetooth. It uses noise-reducing technology to ensure you can listen to nice and clear sound. The stable connection also works well for phone calls. Every time the transmitter is turned off, it memorizes which FM frequency, which color and which song was last played and continues there when it starts again. With QC3.0 fast charger: With two USB ports for charging or USB memory. Plug your phone into the QC 3.0 port for extra fast charging! Specifications: LED colors: red, orange, yellow, green, light blue, dark blue, purple (Press "M" to change) Supports: MP3, WMA, WAV, FLAC and APE, as well as SD memory cards and USB sticks. The device supports QC3.0, QC2.0, FCP, BC1.2 Color: Black Voltage: 12V-24V USB: 1 x 5V/1A + 1 x 5V3A Package includes: 1 x FM transmitter 1 x AUX cable Wireless FM transmitter for the car Fast charging with QC3.0 Clear and crisp stereo sound 7 different LED colors