Get Behind The Shield With The ArmorAll Bluetooth FM Transmitter and Car Charger. It can be easily added to any car without any type of installation or wires, simply just plug into a car outlet. The voice assisantace and built-in microphone with echo reduction allows you to drive safe and keep your eyes on the road with conveinent hands-free talking. The transmitter uses FM radio frequency to pair to Bluetooth, allows access your smartphone's voice commands with one button, and wirelessly streams music to your car stereo. Best yet, the 3.4Amp Dual USB Ports lets your charge up to two devices at once.