These rechargeable collars are designed to work as a perfect replacement for the newer 800 series systems by Invisible Fence®. Different configurations are available to ensure compatibility with your Invisible Fence®. There is a lot of technology that is packed into a very small, comfortable case. Completely waterproof, they are also exceptionally lightweight.
To make certain that your new collar is going to properly communicate with your Invisible Fence® system, you need to find out what frequency your fence is programmed to. The frequency will either be a 10K or 7K.