These attachments are compatible ONLY with E-Collar Technologies products and will not work with other brands.
From the manufacturer:
These winged comfort pads will fit all E-Collar Technologies small receivers and the RX-120 large receiver.
The Long Coat Winged Contact is the preferred contact solution by professional dog trainers worldwide due to the consistent contact it will make on almost any breed with a thick coat! German shepherds, border collies, Shetland sheepdogs, and other long hair breeds won't mind wearing their soft e-collar for long periods of time with the Winged Ultra Comfort Pad.
The Short Coat Winged Contact is perfect for dogs with shorter coats to maintain constant, consistent contact, no matter where it is fitted on the dogs neck.
Both long coat and short coat winged contacts are available with the titanium contact points as well. These are perfect for dogs with sensitive skin.
THIS IS A NON-RETURNABLE PRODUCT
Manufacturer's warranty info can be found here: https://www.ecollar.com/pages/warranty-returns-and-cancellation