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We understand that the battery compartment on our OnGuard handheld training device can be somewhat tricky to open, and we are here to help. You'll see on the bottom of the device that there are 2 arrows near the slide.
While holding the OnGuard with one hand, use your other thumb to move that slide in the direction of the arrow marked with a number 1. While the slide is in that position, push it towards the arrow marked with a number 2. Then you'll be able to flip that bottom piece up and insert your batteries.
As a vet I have seen some terrible examples of dog poisoning over the Christmas period. In many cases the owner was totally unaware of the hidden dangers and was simply intending to be kind to their dog who was eager to share in the festive treats.