And durable sonic speed usb charging charge your device in your car by using cigarette lighter outlet input: dc 12v – 24v output: dc 5v / 3.4a (max) usb port: 1 port size: 48 x 29 x 24mm with retail package compatible with: iphone series ipad series ipod series tablet pcs samsung galaxy tab other mobile phones and digital devices that can reply on usb for power input voltage 12-24v,support almost all types of cars; intelligent output detection,when you charging phone,the voltage will change to 1a for adaptation; build-in chips,more efficient, more stable current to better protect your device; buil-in micro protection chips(overheat protection, overcurrent protection, overvoltage protection, short circuit protection, current limiting protection, short-circuit shutdown etc. Functions),provide perfect protection anywhere anytime.