This FM transmitter is great for people who do not already have in their car. Like any other one you pick an FM station that doesn't have any audio and you're good to go. Setup was extremely easy, basically just plug and play. Features - Color: Black - Size: 12.5x9.8x6cm - Material: ABS. - Input: 12-24 V; Output 2 USB ports: smart charge port which can intelligently identify android or iPhone devices. - Colorful display LCD backlight displays song name or incoming phone number/ shows car's battery level when car start. - V3.0: for car adapter is advanced V3.0 consumes much less energy and lasts much longer than the previous version. - Wide application: this car radio transmitter works with most of devices with , like iPhone, iPad, iPod, tablet or MP3 player. - Automatic power off and memory channel. Specification - Frequency range: 87.5-108MHz - Output Frequency: 20Hz-20 KHz - Supply voltage: 12-24V - USB Charge output: 5V/2.8A (MAX) - Support file format: MP3/WMA/FLAC/WAV - USB Maximum support: 32G - Micro TF Maximum support: 32G