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  • Napco Gemini GEM-K4RF Keypad with Built-In Wireless Receiver β€” Specifications

    September 08, 2026 2 min read

    Specification sheet for the Napco Gemini GEM-K4RF keypad with built-in wireless receiver and the full K-Series Gemini keypad lineup.

    Full text manual (for reference)

    Product specification sheet for Napco's Gemini GEM-K4RF keypad with built-in wireless receiver, plus an overview of the full K-Series Gemini keypad lineup (GEM-K1CA, K2AS, K3DGTL, K4RF, K4).

    GEM-K4RF β€” Keypad with Built-in 32-Point Wireless Receiver

    • Integrated receiver for up to 32 built-in wireless points β€” twice the RF coverage of competitive units when used with Gemini panels supporting K-Series keypads.
    • Saves time (one unit to mount) and money ($16–$57 less than buying a separate alpha keypad and wireless receiver).
    • Supports all standard Gemini crystal-control transmitters.
    • Works with all GEM-P816, P1632, P3200, and P9600 panels. Get 16 points on older panels, or 32 points on newer panels marked "K-Series Support."
    • Large backlit English-language display.
    • EZ-programming with intuitive Stay & Away keys.
    • A matching GEM-K4 model is available without the built-in receiver.
    • Also available bundled with panels: K816RFPK (with the P816) or K1632RFPK (with the P1632).

    GEM-K4RF / K4 Panel Compatibility

    Keypad P816 P1632 P3200 P9600
    K4RF βœ“ βœ“ βœ“ βœ“
    K4 βœ“ βœ“ βœ“ βœ“

    K-Series Gemini Keypad Family

    All K-Series keypads share these features:

    • Intuitive Stay & Away keys
    • Large "Soft Touch" backlit keys with tone
    • Backlit displays for easy reading
    • Wireless Transmitter Signal Strength indication (most models)
    • Super EZ-Programming Mode (Q&A format with Custom Alpha models)
    • DΓ©cor-friendly Soft White design
    • Fire, Police, and Auxiliary programmable panic keys
    • Fingertip reference chart

    Model-Specific Added Features

    • GEM-K1CA (Custom Alphanumeric Keypad): Stay & Away ease-of-use buttons (hold-down for one-button "night mode" arming); deluxe 32-character backlit, menu-driven dual-line display; custom alphanumeric zone directory; built-in 4-zone expansion module; wireless signal strength display (1–10); EZ keypad programming with Q&A-style configuration.
    • GEM-K2AS (Alpha/Symbol Keypad): Stay & Away buttons; unique backlit combination alphanumeric and symbol display.
    • GEM-K3DGTL (Digital Display Keypad): Stay & Away buttons; vivid dual 7-segment digital display.
    • GEM-K4RF (Integrated English Language Keypad with Built-in 32-Pt. RF Receiver): Large fixed English display; built-in Gemini wireless receiver supporting up to 32 points; proven crystal-control wireless performance; supports all Gemini transmitters; Stay & Away buttons. Matching keypad without receiver: GEM-K4.

    K-Series / RP-Series Compatibility Chart

    Keypad P816 P1632 P3200 P9600 X255
    K1CA βœ“ βœ“ βœ“ βœ“ βœ“
    K2AS βœ“ βœ“ βœ“ βœ“ β€”
    K3DGTL βœ“ βœ“ βœ“ βœ“ β€”
    K4RF βœ“ βœ“ βœ“ βœ“ β€”
    K4 βœ“ βœ“ βœ“ βœ“ β€”

    Independent Wireless Performance Testing

    NAPCO commissioned independent testing (by NY Testing Laboratories, Inc.) comparing Gemini crystal-control wireless transmitters against ITI Concord, Ademco Vista, and DSC Power window/door transmitters in a tough industrial warehouse environment with metal and motors present. NAPCO's GEM-TRANS2 outperformed the competition by as much as 50%, delivering usable signal strength out to 800 feet versus roughly 400–500 feet for the competitors tested.

    Manufacturer Contact

    NAPCO Security Technologies, Inc.
    333 Bayview Avenue, Amityville, New York 11701
    1-800-645-9445 Β |Β  Fax 631-789-9292 Β |Β  GSA GS-07F-0039H
    www.napcosecurity.com