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Replacement Extender Sensor Cap for Barkless Pro BP-504 The Barkless Pro BP-504 requires the use of an extender sensor cap for optimal performance, for dogs with long fur. When transitioning to the longer contact points, it is essential to attach the extender sensor cap to ensure that the middle sensor post remains level with the contact points. This adjustment ensures that the sensor post maintains proper contact with the dog’s vocal cords to effectively activate the collar receiver.
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🇺🇸 Ship from USA · On Agora since 2026
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