The product is a set of three Aiphone RY-1824L Form C Relay Door Release units, compatible with the KB, JF, JO, and JP Series. These relays are specifically designed for door entry systems and intercoms, providing a secure and efficient way to control access to your home or property. With the trusted Aiphone brand and reliable C Relay design, these units ensure smooth and consistent operation for your security needs. Upgrade your home security system with this set of new, high-quality door release relays.