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Questions about this product? Free pre-sales support from a senior specialist — product questions, compatibility checks, BOM quotes, price confirmation — typically answered within one business day. Need camera placement or system design work? Engineering time is $175 per hour (qty 1 = 1 hour). Hardware buyers get up to one hour ($175) credited back on their order.
The BLK-4 is a line-status LED strobe and beacon kit designed to provide high-visibility visual alerting for analog emergency telephone systems. Where audible-only indication fails — noisy mechanical rooms, loading docks, stairwells, or ADA-compliance scenarios — the BLK-4 adds a 360° LED strobe that signals incoming ring, line active, and emergency states without flashing on an incoming ring when paired with a compatible controller. The kit includes a control module and a blue SL-2 LED strobe, powered by a 120V AC to 12V DC adapter. Flash rate defaults to 60 flashes per minute with four programmable patterns: Single Flash, Double Flash, Quad Flash, and Flicker Flash — letting you match facility alerting protocols without rewiring. Maximum strobe output reaches 323 lumens through the clear lens (included); amber, blue, and red lenses are available separately when color-coded zoning is required. The BLK-4 carries an operating range of -15 to 130°F, making it viable in unconditioned spaces like parking structures or utility corridors. The indoor BLK-4 tolerates 5–95% non-condensing humidity; for wet or washdown environments, the BLK-4-EWP variant handles up to 100% condensing humidity with a durable polycarbonate lens.
The BLK-4 is compatible with any analog emergency telephone system and is explicitly validated with Viking's E-1600-20A emergency phone. The steady-on feature ensures the strobe does not flash on incoming ring — a critical behavioral distinction for facilities where strobe activity must unambiguously indicate an active emergency versus a ringing line. The control module interfaces via CAT-5 (single pair up to 125 ft; two pair up to 225 ft; three pair up to 325 ft; four pair up to 475 ft) or SL-2 wire runs (three wires up to 100 ft; six wires up to 300 ft) — plan your wire run before ordering to confirm the correct gauge and pair count for your installation distance. Relay contact rating is 0.5A at 125V AC / 1A at 30V DC; minimum loop current is 15mA and minimum ring voltage is 25V RMS, so confirm your telephone's line output meets these thresholds before deploying.
The kit mounts to a single-gang electrical box using the included hardware. The 12VDC power adapter (120V AC input) powers the strobe — a dedicated outlet within reach of the strobe location is required. Wire connections use the 16 included gel-filled butt connectors, which provide moisture resistance at splice points without additional weatherproofing compound. Disable/Info switch input is rated 50mA/80mW maximum; do not exceed this threshold on any auxiliary input. Ringer equivalence is 0.5 REN — verify your telephone line can support the combined REN load if additional devices share the line.
Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. Adjust quantities and add the entire bundle to your cart in one click.
PoE LED beacon strobe with IP56 rating for security integration
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