2 Port USB 3.0 Car Charger: Supports charging two devices at the same time, one port is 3.0 port for fast charging. This fast charging port is also compatible with: 2.0, Huawei FCP, Type C and Samsung. Charger efficiency is over 80%. Answering Hands-Free Calls: High performance microphone with CVC noise reduction technology to give you crystal clear calls. Answer/dial again/release or hang up a call with just the push of a button. Immerse yourself in Hi-fi music: Plug a USB flash driver containing MP3 files into the USB port on the right and enjoy your music. If that's not enough, it can also support your playlists without distortion of the original signal caused by MP3, iPhone, Android smartphones and more Bluetooth devices. Wide Compatibility: FM Transmitter car bluetooth can be paired with all bluetooth devices such as iPhone, iPad, iPod, tablet, Samsung, HTC, Sony and other Android smartphones. Multiple safety protection: built-in overcurrent protection, protection surge protection, intelligent temperature control, short circuit protection.