GEM-P1664 Hybrid 8 to 64-Zone Control / Communicator features 8-Zone expandable to 64-Zone with multiplexing and supports all standard Gemini RP and K-Series Keypads, plus new Gemini DK-Series Door-Style Keypad as well as reliable, NAPCO Gemini crystal-control transmitters and receivers, too. Supporting up to 64-User codes and 16-Relays, the GEM-P1664 control features easy menu driven Self-Programming Plus keypad programming (for all zones), which includes new alpha keypad question-prompts, even for setting test timer, fire zones, and exit/entry and follower zones. The Napco GEM-DK1CA is a sophisticated door-style keypad designed for enhanced security system management with user-friendly features and contemporary styling. This keypad features a bright blue backlit custom LCD display that provides clear visibility and an alphanumeric zone directory for easy navigation. The blue backlit keys illuminate upon touch and include convenient stay and away functionality, enhancing user experience.