Voltage: 12V Total current: 80mA Working temperature: 70 Applied to all kinds of U disks, USB1.1 and USB2.0 Supports the USB flash disk device (Version 1.1 or 2.0) Search (MP3 File) for whole disk 3 buttons with 6 functions Antenna: Built-in Power: Car Lighter Displays: Power LED, Play and Pause LED Audio Out: FM Transmitter frequencies(MHZ): 87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9.