The C82 is an One‐button SIP Door Phone with RF card reader and advanced audio system with the echo cancellation function. With the C72 touch screen control pad, you can speak to visitors at any time. The C82 offers keyless control and convenience for the users which supports many ways of opening the door without a key. The door can be open remotely but also local IC/ID card if there is an electronic door lock. It’s ideal for control communication and security over internet such as business, institutional and residential applications.