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    SECO-LARM HL Series 917MHz Long-Range RF Transmitters & Receivers — Brochure

    September 08, 2026 2 min read

    Product brochure for the SECO-LARM ENFORCER HL Series 900MHz (917MHz) long-range RF transmitters and receivers.

    💾 Download Original PDF
    Full text manual (for reference)

    Product brochure for the SECO-LARM ENFORCER 900MHz HL Series RF transmitters and receivers (917MHz actual frequency) — long-range, wide-voltage RF control components using digital modulation for improved interference immunity and consistent performance across environmental extremes.

    Key Features

    • Long range: up to 1,800ft (550m) line of sight.*
    • Wide voltage range: up to 48VDC.
    • Digital modulation for improved immunity to interference and better signal penetration through obstructions.
    • Up to 10-year battery life on transmitters using common CR2032 coin cell batteries (based on ten 1-second button presses per day).
    • PCB antenna — no exposed antenna to install, adjust, vandalize, or damage.
    • Consistent performance even as voltage drops or temperature swings (hot/cold) — unlike typical 315/433MHz systems whose range drops under the same conditions.
    • Up to 99 button codes per channel; digital LED display shows signal strength and programming status.

    *Actual operating range will vary greatly depending on the installation and operating environment.

    Receiver Specifications

    Frequency available 917MHz (868MHz also available, CE — contact SECO-LARM)
    Memory capacity Up to 99 button codes per channel
    Operating voltage 10–24 VAC or 9–48 VDC
    Operating current Standby: 8mA@12VDC / 5mA@24VDC / 2mA@48VDC  |  Active: 100mA@12VDC / 50mA@24VDC / 25mA@48VDC per channel
    Relay output type Independent, sequence, or access control
    Relay output modes 1–99 seconds momentary, 1–99 minutes momentary, toggle, latch, follow (validity)
    Relay contact rating 2x Form C, 10A@14VDC
    Connectors Screw terminals: power (+,–), 2 relays (NO/NC/COM)
    LED digital display Signal strength, programming functions, etc.
    Operating temperature -40° to 167°F (-40° to 75°C)
    Dimensions 3-7/8"x2-7/16"x1-3/16" (99x62x30mm)

    Transmitter Specifications

    Frequency available 917MHz (868MHz also available, CE — contact SECO-LARM)
    Battery CR-2032 x 2
    Dimensions 3-1/16"x15/16"x1/2" (78x34x13mm)

    Transmitters are available in 1-button and 2-button configurations. Receivers offer up to 2 outputs to control 2 devices or 2-door systems.

    Applications

    Consistent performance across adverse environments — hot/cold temperature swings, RF interference, and environmental interference — makes the HL Series a good fit for gate/garage operators, access control, perimeter security, and home automation, both indoors and outside where wall-mounted receivers may see variable temperature and voltage conditions.

    OEM/ODM

    SECO-LARM offers a full range of ENFORCER RF transmitters and receivers spanning access control, perimeter security, and home automation, and can manufacture products under a customer's own brand and logo. All products are FCC or CE certified.