Voice Assistant Support voice control. You can wake-up Siri or Google Assistant and make calls, send text messages or get navigation through through voice command. Super Compact Design Simple Bluetooth connection. No complicated operations. No need to download any apps. Works for various devices such as smart phones, tablets, mobile music players, etc. Easy to Operate Surface All functions are concentrated on a 1.6*1.6 inch plane. You don't have to look for the location of the charging port or buttons. Dual USB & QC3.0 Charging There are 2 usb charging ports. One of them supports QC3.0 fast charge. You no longer have to worry about your phone running out on the road. 3 Music Playback Modes Can play musics through Bluetooth connection, through U Disk or through TF card. One more model has one more option. Choose the way you like and enjoy your journey. Bluetooth 5.0 Bluetooth 5.0 transmission won't be distorted. Use DSP technology which makes full duplex sound quality, allows you enjoy crystal clear podcasts. Bluetooth Connection Method 1. Tune your car radio to a blank FM channel.(Recommend to use FM107.5 channel) 2. Insert the Arsvita FM transmitter into the car cigarette lighter. 3. Tune the FM transmitter to the same channel as the car radio.If the static noise is loud after the channels are synchronized, please change to another blank channel. 4. Search for the Bluetooth device "Arsvita" on the mobile phone and complete the Bluetooth connection. 5. Play music, wake up Siri / Google assistant, turn on voice navigation, and do whatever you want. 6. If you pursue high-quality sound quality, please try different blank channels and find the one with the least noise. Automatic Connection Turn on Bluetooth to find the paried products. Safety First Quipped with electric protection of overcurrent;overvoltage; overcharge; overload;overheat ;and short circuit, it’s more reliable and safer to use. Perfect Fit Both sides of the anti-slip shrapnel, can be perfectly adapted to most models of cigarette lighters.