Viking LED Security Strobe Beacon with Weatherproof Single Gang Box BLK-4, Blue, 120V AC
See the call before you hear it.
An LED strobe beacon in a weatherproof single gang box that flashes for ringing, off-hook or line in use, so calls get noticed in loud or busy areas.

A ringing phone is easy to miss in a noisy space.
In factories, garages and warehouses, a bell or ringtone gets lost in the noise. A visual signal gets noticed when sound does not.
Built to be seen and installed
The BLK-4 pairs a high-output LED strobe with a weatherproof box and a control module you can configure for the signal you need.
Four flash patterns
Choose Single Flash, Double Flash, Quad Flash or Flicker Flash to suit the area.

programmable flash patterns
Single, Double, Quad and Flicker Flash.
Six brightness settings
Programmable beacon and strobe brightness lets you tune the output for the space.
Flexible triggering
Signal ringing, off-hook, a combination of both (line in use), or trigger from a contact closure, with SPDT relay contacts provided.
Weatherproof, durable build
A polycarbonate lens and weatherproof single gang box, with a design immune to shock and vibration.
Everything you need to know.
| Brand | Viking Electronics |
| Model | BLK-4 |
| Product Type | Sounder, Strobe |
| Alarm Type | Audible, Visual |
| Light Source | LED |
| Input Voltage | 120V AC |
| Connectivity | Wired |
| Durability | Weather Proof |
| Mounting | Flush, Gang box, Post, Surface, Wall |
| Lens Color | Amber, Blue, Clear, Green, Red |
| Knockouts | 0.75" for conduit |
| Shipping Weight | 2.4 lb |
Viking LED Security Strobe Beacon with Weatherproof Single Gang Box BLK-4, Blue, 120V AC
The Viking BLK-4 is an LED security strobe beacon with a weatherproof single gang box and control module. It can signal ringing, off-hook, line in use, or be triggered from a contact closure, with four flash patterns and six brightness settings.
Key Features
- 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)
- 0.75" 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.
- SPDT relay contacts provided.
Specifications
- Brand: Viking
- Model: BLK-4
- Product Functions: Alarm
- Product Type: Sounder, Strobe
- Alarm Type: Audible, Visual
- Connectivity Technology: Wired
- Application/Usage: Alarm Panel, Camera, Emergency, Factory, Garage, Hallway, Indicator Light, Indoor, Industrial, Outdoor, Security, Signaling System, Warehouse
- Color: Gray
- Durability: Weather Proof
- Form Factor: Flush Mount, Gang box Mount, Post Mount, Surface Mount, Wall Mount
- Lens Color: Amber, Blue, Clear, Green, Red
- Input Voltage: 120V AC
- Power Source: AC
- Bulb/Tube Type: LED
- 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
- Shipping weight: 2.4 lb
Typical Uses
- Visual ringing and call indication in noisy areas
- Security and alarm signalling
- Factories, garages and warehouses
Compatibility
Please confirm compatibility with your phone line, PBX/VoIP system and existing Viking equipment before ordering. Contact us with your current models if you need help checking.
Need help with compatibility?
Looking for a manufacturer part number, compatible replacement, or quantity order? Contact Raztechs for sourcing and quote support.

Viking Electronics BLK-4, ready to order.
- Control Module
- SL-2 blue LED Strobe Light
- 12VDC Power Adapter
- 16 Gel-filled Butt Connectors
- Single Gang Weatherproof Mounting
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