Add to the 450RT to make it a 2-dog system. Use with the 250RT or 350RT transmitter to replace a lost collar/receiver. Takes a user-replaceable battery (included), so there's no need to worry about whether you remembered to charge your collar. We also recommend keeping a spare battery with you and you can easily replace the battery if needed. There is a low-battery indicator on the collar. The collar/receiver weighs less than 3 ounces, has no cumbersome external antenna, and is fully waterproof.
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