Durable mini stainless steel flush mount handsfree low power consumption speakerphone intercom for emergency and courtesy communication. Designed to automatically dial a preprogrammed number from 1-11 digits .Press the button to make a handsfree disconnect call. Telephone can be set for function keys like repeat , speed dial ,volume control ,etc. Equipped with weatherproof, puncture resistant speaker and microphone, and tamper resistant security screws.