As a general rule, the products that begin with “SD” are compatible with each other. This means that the SD-2025 Collar is compatible with the SD-3000 Basic Contain ‘N’ Train System, along with the SD-2000 Basic In-Ground Pet Fencing System, and the SD-2100 Rechargeable In-Ground Pet Fencing System.

The restrictions are that the SD-2025 Collar will not work with the Remote Control for the SD-3000, nor is it compatible with the Ultrasmart products.

The Innotek SD-2025 Collar, Compatible with the Innotek SD-3000/2100/2000 Pet Fences is On Sale with Free 2-Day Shipping from Muttfence.com

After some time on the phone helping him locate the transmitter unit so that he could read off the serial number, we were read numbers that turned out to be the lightning protectors. Lightning protectors sit inline in order to prevent a lightning strike from destroying the transmitter, or causing damage to the house wiring.

For this particular customer, he had two lightning protectors (must have been from each of the visits from the installers). The transmitter unit, rather than sitting in-line, terminates each end of the wiring loop, so the wires in and the wires out lead to and from the transmitter unit. He unplugged the transmitter from the wall and read the serial number to us. We were able to identify the transmitter as being from an Innotek SD-2100 Rechargeable In-Ground Fencing System.

Knowing that the fence is an Innotek SD-2100, this gave us two options for collars: option 1, Innotek SD-2025 Basic Receiver Collar, or option 2, Innotek SD-2225 Rechargeable Receiver Collar.  Both receiver collars are compatible with the SD-2100. The difference is that the SD-2025 is about half the price of the SD-2225, but will require batteries to be changed periodically.

Our customer already had the collar charger, so he opted for the additional upfront cost of the Innotek SD-2225 Receiver Collars, knowing that an occasional charge would save on the cost of batteries over time. As with all of our collars, we shipped it to him via USPS 2-Day Air at no extra cost.