The Innotek SD-3000 starts with a very bare system. Basically you add the Innotek SD-2000 and a remote correction for $ 50 bucks more. All you are getting is a system with remote correction that is not as effective.
The SD-3000 shares the same base station as the Innotek SD-2000. It is a small unit that can power up to 5 acres of boundary wire. The center dial adjusts the boundary width, there are two ports for the boundary wire on the bottom and an on / off switch.
The Innotek SD-3000 collar is a boxy collar similar to the SD-2000 on which it is based.
It uses a generic disposable 3V lithium battery. The battery is good for about 2 months in containment mode and about 300 hours in remote correction mode. Notably the SD-3000 has an LED indicator that tells you when the battery is low, an important feature missing in the SD-2000.
The SD-3000 has one correction level in containment mode, which makes it not flexible enough for most installation. You want at least three correction levels to be able to increase or decrease the correction level to suit your dog. Using the collar in conjunction with the supplied remote control you can use the collar for remote correction. You switch the collar into remote containment mode by holding the red dot on the collar against the same dot on the remote. There are four levels of correction in the training mode.
A word of caution, remote training is not an easy solution to behavioral problems and should not be used unless you have some experience or are working with a good trainer. It can be a very useful tool but it is not for everyone, and particularly not for novice dog owners. It is very easy to do more harm than good.
The system comes with the standard 500 feet of 20 gauge wire, 50 flags and two splices. Innotek's one year full warranty after which time repairs are performed along a fixed price schedule.
It should be a good deal for $ 50 to add remote correction to the dog fence. But, the problem is that this is still an average containment system, with only a single correction level. With the extra $ 50 you could get a very decent system like the PetSafe Stubborn which does not have remote training. It does have the basic containment function and that is where you are better off spending your money.
If you have a little more and want something with remote correction, Innotek's IUC-5100. With a smaller rechargeable collar, three correction levels and the collar tester, the IUC-5100 is a vastly better choice.