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Usually ships the same or next business day. In stock at our TX warehouse.
Calculated at Checkout
Stock Update:
10/03/2023 07:02:18 AM PST

Bulk discount rates

Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 2 - 3 and pay only $158.59 each 158.59
Buy 4 or above and pay only $155.28 each 155.28
Stock Update:
10/03/2023 07:02:18 AM PST


This item is brand-new, factory sealed.

  • Ringing Phone or TTY indication for the hearing impaired
  • Ringing phone indication in loud warehouses and factories
  • Emergency illumination for emergency phones in elevators, campuses, hallways, parking ramps, etc.
  • Alarm indication for security systems or alarm panels with phone dialers
  • Durable polycarbonate lens
  • High output long life LED technology
  • Four programmable flash patterns:
  • Single Flash
  • Double Flash
  • Quad Flash
  • Flicker Flash
  • 6 programmable beacon and strobe brightness settings
  • Immune to shock and vibration
  • Flush mount or surface mount with weatherproof single gang box (included)
  • 3/4 knockouts for connecting conduit, etc.
  • Strobe and control module may be installed separately
  • Can be configured to signal: ringing, off-hook, a combination of both ringing and off-hook (line in-use), or triggered from a contact closure
  • One set of (NO) normally open and (NC) normally closed relay contacts provided
  • Selectable ring cadence mode (strobe light will remain flashing between rings)
  • Switched 12V DC output (follows relay activation for powering strobe lights, cameras, etc.)
  • On/off switches for ring detection and off-hook/loop detection
  • Disable input, ideal for use with two-button emergency phones like Vikings E-1600-20A (DOD# 215), will not activate strobe light on Info calls
  • Power: 120V AC to 12V DC adapter provided
  • Maximum Power Supply Run Length on CAT-5: 1 pair = 125 ft, 2 pair = 225 ft, 3 pair = 325 ft, 4 pair = 475 ft
  • Maximum SL-2 Wire Run Length on CAT-5: 3 wires = 100 ft, 6 wires = 300 ft
  • Strobe Dimensions: 111mm diameter x 69mm (4.38" x 2.75")
  • Control Module Dimensions: 74mm x 53mm x 25mm (2.9" x 2.1" x 1.0)
  • Shipping Weight: 1.5 kg (3.3 lbs)
  • Operating Temperature: -26 to 54C (-15 to 130 F)
  • Relay Contact Rating: .5A @ 125V AC/1A @ 30V DC
  • Minimum Loop Current: 15 mA
  • Minimum Ring Voltage: 25V RMS
  • Ringer Equivalence: 0.5 A REN
  • Disable/Info Switch Input: 50mA/80mW maximum
  • Humidity
  • BLK-4: 5% to 95% non-condensing
  • Mounting: Fasten to wall, post, etc. with complete surface mounting hardware included
  • Connections: Color coded wires with gel-filled butt connectors


    Package Contents:   
    • 1 x Control Module
    • 1 x SL-2 blue LED Strobe Light
    • 1 x 12VDC Power Adapter
    • 16 x Gel-filled Butt Connectors
    • 1 x Single Gang Weatherproof Mounting


    Country of Origin:   
    United States



    Power Description
    Power SourceAC Supply
    Input Voltage120 V AC
    Physical Characteristics
    Lens Color
    General Information
    Brand NameViking Electronics
    Manufacturer Website Address
    Marketing InformationThe BLK-4 provides high visibility indication of analog line status through a high powered LED strobe and / or beacon visual indicator. The BLK-4 is the ideal solution for the hearing impaired and can be used equally well in loud warehouses or factories, where ringing phones cannot be heard. Alternatively, the BLK-4 can be used to add emergency notification to pre-existing emergency phones by turning on the strobe light when the emergency phone is in use.
    The included control module has a disable input which is ideal for two-button emergency phones, such as Viking's E-1600-20A, allowing "Info" button calls to be placed without activating the relay (turning on the emergency strobe light, camera, etc.).
    Four DIP switches are provided for turning ring detection on or off, off-hook / loop detection on or off, 12VDC or dry relay contact output, and for selecting a ring cadence mode which allows the relay to follow ringing or to remain activated during the off time of standard ring cadence. The control module can be installed on any standard telephone line or analog PABX / KSU station. The strobe can be interfaced to flash on ringing, off-hook or a combination of ringing and off-hook (line in-use).
    For outdoor installations where the unit is exposed to precipitation or condensation, use model BLK-4-EWP. For more information on Enhanced Weather Protection (EWP), see DOD 859.
    The BLK-4 includes: (1) control module, (1) SL-2 blue LED strobe light, (1) 12VDC power adapter, (16) gel-filled butt connectors and (1) single gang weatherproof mounting box with gaskets and hardware.
    Product TypeSounder/Strobe
    Product NameLED Strobe/Beacon
    ManufacturerViking Electronics, Inc
    Manufacturer Part NumberBLK-4
    Product ModelBLK-4
    Packaged Quantity1
    Technical Information
    Alarm Type
    Form Factor
    DurabilityWeather Proof
    Bulb/Tube TypeLED
    Connectivity TechnologyWired
    Product FunctionsAlarm

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    Warranty Information

    All Items are Brand New, Factory Sealed and come with a standard warranty. [Read our policies]
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