FM Transmitter and USB Charger for in-Car use Key Features: Simple plug-and-play connection to any Car FM stereo Provides wireless connectivity between transmitter and stereo Elegant backlight LCD Screen with simple easy access buttons Adopts DIGITAL PLL sound coding technology, which maintains the HI-FI effects Battery-free transmitter that charges MP3 player with USB connector while playing Parameters Operation Distance: >10metres Operation Current: 45mA Frequency range: 87.7-107.9MHz Operation Voltage: DC12 V PLUG: 3.5 Stereo plug and USB2.0 Plug. Dimensional: W49 x H32 x D109mm Weight: 55 g (including line)