The Innotek SD-2025 was used with the SD-2000 systems, but it is compatible with all Innotek in-ground fence systems, so it could be used as an additional or replacement collar for any Innotek in-ground fence system, including the Innotek SD-2225 (SD-2100), Innotek UltraSmart IUC-4225 (IUC-4100), or Innotek UltraSmart IUC-5225 (IUC-5100). This collar is even compatible with the PetSafe UltraSmart fence system PIG00-13619 (PIG00-13620).
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Being that these are used items, the condition does of course vary slightly from unit to unit. With that in mind, please know that we will never send you an item that has any unnatural wear or damage. Every unit is professionally tested, inspected, cleaned, and packaged.