Black Mini Rechargeable Car Fm Transmitter Radio for iPhone 4 Samsung 4S iPod MP3 MP4 FM Transmitter for iPod / iPhone 3G / 3GS / 4 and other MP3 / 4 players,mobile phones. LCD displayers frequency with backlight. With Touch key design,High fidelity stereo. Digital PLL,transmisson is stable in different environments. Full frenquency range.