Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What does this plug in to?
Document: When its not being used it can be disconnected and  put awaysimple to useit has  weather channelsit feels solid in your handits loud, it also has a plug for auxiliary speaker
Had one of this before. so it was a no brainer when I bought other one. It is easy to install. It is designed for small spaces. It is easy to use, the directions or great. If you need a extra speaker it has plug for it.
I've had one of these for years, and the only noticeable negative I've found is that the speaker volume isn't loud enough for an old guy in a noisy truck. That was cured by adding a plug-in remote speaker.
I was looking forward to using this product. When I received the CB Radio I find that it does not plug into the cigarette lighter as I thought, it connects directly to the vehicle battery. Can't do that so it is going back. I give Amazon one star for not making this clear.
I had this CB in my Toyota Tacoma, which I sold in 2007. It is probably the best CB for limited space environments. The microphone/control head attaches to the connector box which is about the size of the palm of your hand. My connector box was under the seat. The controls are easy to use and see.I connected an external speaker, the connector box has a plug for it.
By being able to buy a second "connection" box for ~$25, I can use the main unit in two vehicles without the full expense of two CB's.Hookup is easy with a power, ground and antanna connections. The plug for the main unit to the connection box can be run from undernieth the dash or console or mounted in a hole with the supplied mounting plate and grommet.
Installed this on my Tacoma to use on four-wheeling trips. I installed the &#34;plug box&#34; under my center console and left the pig tail hanging out near the driver-side floor. It works great!Paired with a Uniden speaker (BC7) in the center console and a 4' Firestik II antenna (custom mounted to the bed rail), this is the perfect trail set up for me.
I bought this radio and the Cobra 1500 antenna. Both arrived 2 days later in perfect condition. Assembly, installation, and first use were a piece of cake. Couldn't have been easier. Since this is a CB radio, not a ham radio, the power is restricted to 4 watts. Therefore it was easy to install and power up using a cigarette lighter plug. This makes the whole rig easily portable from one vehicle to another.
What a great idea and what a pleasant surprise! This thing works great and is extremely easy to use. It took me a whole 5 minutes to hook it up (basically plug it in and connect it to an antenna) and it fired right up. My antenna is a magnetic mount 36" stainless steel whip Wilson "Little Wil". Right away with no antenna tuning I was getting a 5 mile range under hilly, forested terrain. Out on the open road about 7-8 mile range.
We use the unit in a Corvette, and there is no convenient place to mount a regular CB; the Cobra solves that problem nicely. We had the local stereo shop install a cigarette lighter plug on the Cobra power cord so we just plug it into a lighter outlet. The built in speaker is rather weak, we bought a Cobra S500 external speaker that sits on the shelf behind the driver seat and works very well. The volume and squelch controls are sometimes moved by accident when handling the unit.
Answer: The handset plugs into a pigtail which comes from a small box (2x2x4) The box accepts the 12v power and antenna .  If you have limited mounting area , this is a perfect unit.  I have a Corvette and I am able to connect the mic radio when I need it and nothing shows otherwise.  I belong to a Corvette club and several members have enjoyed this CB over the larger case .  The radio works as good as the larger unit.