IdeaNext Wireless FM Transmitter with 3.5mm Audio Plug and USB Car Charger Radio Adapter Car Kit Perfect audio/mp3 FM radio transmission function guarantees amazing sound quality. Easy installation and compatible with any devices with a 3.5mm jack, including smart-phones, tablets, PCs, MP3 and MP4 players. Comes with an extra USB port (Output 5V/2.4A) to charge your cell phones, GPS or other digital devices simultaneously. Wide FM Frequency Range: 88.1~107.9MHz,(0.1Mhz/step), you will always find the suitable empty frequency to use it. Features a high-contrast, easily-read display and button controls. It even comes with an extra USB port to charge your device simultaneously.