from your vehicle’s cigarrette lighter
To power your scanner from a 12V power source 
in your vehicle, such as a cigarette-lighter socket, 
you need a 12V, 600 mA DC cigarette-lighter 
adapter (not supplied), available at your local 
  Insert the adapter’s barrel plug into the 
  Plug the adapter’s other end into your 
vehicle’s cigarette lighter or power socket.
When you use a cigarette-lighter adapter, you 
might hear electrical noise from your engine 
while scanning. This is normal.
vehicle’s cigarette lighter or power socket.
When you use a cigarette-lighter adapter, you 
might hear electrical noise from your engine 
while scanning. This is normal.