This amplifier kit is very compact with the amplifier built right into the iPhone cradle.  In addition to improving the signal strength to your iPhone, it also charges the phone while it is in the cradle.  You can use your iPhone in or out of the cradle, but when used with a bluetooth car kit or headset (not included), you will get the maximum performance with your iPhone in the cradle.

 

Great for people on the go that need an easy to install boost to their cellular signal in their vehicle.

 

The complete kit includes the iPhone specific cradle with built-in amplifier, external mini-magnet mount antenna, and 12V cigarette lighter power supply.