Each of these products come with one collar, the IUC-4225 for the IUC-4100 Ultrasmart Fence, and the IUC-5225 for the IUC-5100 Ultrasmart Contain ‘N’ Train. The IUC-4225 will work as a fence collar only on both systems, and the IUC-5225 will work with both the fence and the remote.

So, why would you buy one over the other?

• I want to add a dog to my Ultrasmart IUC-5100 Contain ‘N’ Train for the fence only
  You only need to get the IUC-4225 collar
• I want to add a dog to my IUC-5100 Ultrasmart Contain ‘N’ Train for both the fence and the remote trainer
  The collar you need is the IUC-5225
• I want to add a dog to my IUC-4100 Ultrasmart Fencing System
  An IUC-4225 collar is perfect

In a nutshell, if you have an IUC-5100 Ultrasmart Contain ‘N’ Train, you can add a dog just to the fence with the IUC-4225 Ultrasmart Collar, or to the fence and trainer with the IUC-5225 Ultrasmart Collar. FYI: The IUC-5100 has a two dog capacity for the remote trainer.

If you have an IUC-4100 Ultrasmart Pet Fencing System, you should only purchase an IUC-4225 Collar. FYI: The IUC-5225 would work with the fence, but it would additional cost for no benefit over the IUC-4225.

The IUC 5225 Collar has both Ultrasmart Fence and Remote Training Capability

The IUC-4225 is Fully Compatible with all Ultrasmart Fences, but has no Remote Training

Remember all of our receiver collars ship from stock, two-day air to any location in the continental United States at no extra charge!