Nexhi Nexhi-DR-PHNe Intercom Security IP Phone One key to Dial Emergency Call Partner Door Phone Waterproof and dustproof Adopted aluminum surface shell and cast iron bottom case design which has strong structure to anti-destroy High quality voice communication with built-in all kinds of standard speech code Panel adopts advanced wire drawing aluminum alloy material, high strength damage resistant button, strong and durable One key to dial emergency call for help, realize the bi-directional full-duplex voice intercom