General Spec Screen blue backlight LCD screen FM Frequency 88.1-107.9MHz (0.1MHz/step) Function suitable for all automobiles at 88.1-107.9MHz (0.1MHz/step) that brings you perfect music enjoyment Compatibility iPod and iPhone Features Hi-Fi FM transmitter suitable for all automobiles at 88.1-107.9MHz (0.1MHz/step) that brings you perfect music enjoyment. Support iPhone hands-free talking through car speaker system. Holder with snake shape tube design that provides you the best position you need. High quality silicon fixer that provides you the most safe protection. Support charging for mobile phone, GPS and other devices with standard USB 5V, 1A port. Input voltage: 12V DC (vehicle power). USB output: 5V 1A max. Temperature: 0-55 ℃ . Effective distance: ≧ 5m.