Interlogix 521B Photoelectric 2-Wire Smoke Detector

JavaScript seems to be disabled in your browser.
You must have JavaScript enabled in your browser to utilize the functionality of this website.

Free shipping on purchases of $500 or more*

You have no items to compare.

Toll Free: 800-955-5201

Welcome Guest

My Cart

You have no items in your shopping cart.

Search:

Complete Systems
2 Camera Systems
4 Camera Systems
6 Camera Systems
8 Camera Systems
16 Camera Systems
View All Kits
Analog view all analog cameras

HD Over Coax view all HD over coax cameras

Network IP view all network IP cameras
Security Cameras
Dome CamerasHigh Def,Network IP,Analog

Auto Mobile CamerasHigh Def,Network IP,Analog

180º - 360º CamerasAnalog,Network IP,Vandal Resistant

Bullet CamerasHigh Def,Network IP,Analog

Corner/Wedge CamerasHigh Def,Network IP,Analog

Covert CamerasHigh Def,Network IP,Analog

Box CamerasHigh Def,Network IP,Analog

License Plate CamerasHigh Def,Network IP,Analog

Mini board CamerasHigh Def,Network IP,Analog

PTZ CamerasHigh Def,Network IP,Analog

Thermal Imaging CamerasNetwork IP,Analog,Weather Resistant

Wireless CamerasNetwork IP,Analog,Weather Resistant
Analog view all analog cameras

HD Cameras view all HD cameras

Network IP view all network IP cameras
Recording
Digital Video RecordersSD-DEF,HD Recorders,Network Video Recorders

Network Video Recorders4 Channel,8 Channel,16 Channel

HD RecordersHD TVI,HD SDI,HD CVI

Hybrid RecordersAnalog/HD-SDI,Analog/Network

Recording SoftwareAnalytics,Managment,Upgrades

Capture Cards4 Ch,8 Ch,16 Ch,32 Ch

Recording AccessoriesHarddrives,Expansion Bays,Expansion Cards
Monitors
LCD Monitors19 inch,32 inch,42 inch
LED Monitors19 inch,32 inch,42 inch

Monitor AccessoriesMonitor Adaptors,Turnable
Digital Signage Monitors
Field MonitorsComposite,HDMI,RCA,VGA
Public View Monitors9.7 inch,19 inch,32 inch
Network
IP CamerasIndoor,Vandal Resistant,Weather Resistant
NVR4 Channel,8 Channel,16 Channel
Software4 Channel,8 Channel,16 Channel
Network Switches4 Port,8 Port,16 Port
Transmission
Wireless TransmissionAntennas,Receivers,Transmitters
Encoders & DecodersDecoders,Encoders

MatrixSwitchers,Components,Keyboards & Controllers
Data TransmissionConverters,Extenders,Repeaters
Fiber Optic TransmissionConverters,Receivers,Transmitters
UTP Transmission & BalunsPower, Video, Data UTP,Audio & Video UTP
Video DistributionConverters,Digital Signage,Distribution Amplifier
Security Products
Burglar AlarmsKits,Sensors,Accessories
DetectionDIY Detection,Pro Detection,Premier Detection
GPS Tracking
Access ControlKits,Cards & Accessories,Controllers & Modules,Locks
Audio
SpeakersPA Speakers,Recessed Speakers,Two Way Speakers
Recording DevicesCovert,Standard
Microphones
IntercomsMaster Stations,Entrance Panels,Accessories
Audio KitAudio Surveillance,Intercom Kits
Audio Adapters
Audio Mixers
Listening Devices
Audio Counter Surveillance
Audio Modules
PA & Ambient Audio
Accessories
ConnectorsWire Connectors,Adaptors,Pigtails
Installation Tools & SuppliesTools,Wire,Hardware
Camera AccessoriesCamera Lenses,Bubbles & Cages

Keyboard ControllersKeyboard Joysticks,Keypads,Keyboards

Infrared IlluminatorsInvisible,Semi-covert,Standard,White LED
MountsCamera Brackets,Illuminators,Mobile,Monitors
Lens AccessoriesLens Cleaning,Lens Rings,Extension Tubes
EnclosuresCamera housings,Door Stations
PTZ ScannersIndoor,Outdoor
POS Integration
Power Supplies
Surveillance Power ProductsPower Supplies,Back-Up Power Supplies (UPS),Surge Protection
PoE ProductsPoE Adaptors,PoE Midspans,PoE Splitters
Access Control Power productsAccess Control Power supplies,Access Power Controllers,Batteries
Fire & Life SafetyNAC Power Extenders,Batteries
Automation & SecurityPower Supply Chargers,Relay Modules,Timer Modules
REFURBISHED
Cameras
Video Recording
Monitors
Network
Audio
Accessories
Power Supplies
Miscellaneous

Complete Systems
2 Camera Systems
4 Camera Systems
6 Camera Systems
8 Camera Systems
16 Camera Systems
View All Kits
Analog view all analog cameras

HD Over Coax view all HD over coax cameras

Network IP view all network IP cameras
Security Cameras
Dome CamerasHigh Def,Network IP,Analog

Auto Mobile CamerasHigh Def,Network IP,Analog

180º - 360º CamerasAnalog,Network IP,Vandal Resistant

Bullet CamerasHigh Def,Network IP,Analog

Corner/Wedge CamerasHigh Def,Network IP,Analog

Covert CamerasHigh Def,Network IP,Analog

Box CamerasHigh Def,Network IP,Analog

License Plate CamerasHigh Def,Network IP,Analog

Mini board CamerasHigh Def,Network IP,Analog

PTZ CamerasHigh Def,Network IP,Analog

Thermal Imaging CamerasNetwork IP,Analog,Weather Resistant

Wireless CamerasNetwork IP,Analog,Weather Resistant
Analog view all analog cameras

HD Cameras view all HD cameras

Network IP view all network IP cameras
Recording
Digital Video RecordersSD-DEF,HD Recorders,Network Video Recorders

Network Video Recorders4 Channel,8 Channel,16 Channel

HD RecordersHD TVI,HD SDI,HD CVI

Hybrid RecordersAnalog/HD-SDI,Analog/Network

Recording SoftwareAnalytics,Managment,Upgrades

Capture Cards4 Ch,8 Ch,16 Ch,32 Ch

Recording AccessoriesHarddrives,Expansion Bays,Expansion Cards
Monitors
LCD Monitors19 inch,32 inch,42 inch
LED Monitors19 inch,32 inch,42 inch

Monitor AccessoriesMonitor Adaptors,Turnable
Digital Signage Monitors
Field MonitorsComposite,HDMI,RCA,VGA
Public View Monitors9.7 inch,19 inch,32 inch
Network
IP CamerasIndoor,Vandal Resistant,Weather Resistant
NVR4 Channel,8 Channel,16 Channel
Software4 Channel,8 Channel,16 Channel
Network Switches4 Port,8 Port,16 Port
Transmission
Wireless TransmissionAntennas,Receivers,Transmitters
Encoders & DecodersDecoders,Encoders

MatrixSwitchers,Components,Keyboards & Controllers
Data TransmissionConverters,Extenders,Repeaters
Fiber Optic TransmissionConverters,Receivers,Transmitters
UTP Transmission & BalunsPower, Video, Data UTP,Audio & Video UTP
Video DistributionConverters,Digital Signage,Distribution Amplifier
Security Products
Burglar AlarmsKits,Sensors,Accessories
DetectionDIY Detection,Pro Detection,Premier Detection
GPS Tracking
Access ControlKits,Cards & Accessories,Controllers & Modules,Locks
Audio
SpeakersPA Speakers,Recessed Speakers,Two Way Speakers
Recording DevicesCovert,Standard
Microphones
IntercomsMaster Stations,Entrance Panels,Accessories
Audio KitAudio Surveillance,Intercom Kits
Audio Adapters
Audio Mixers
Listening Devices
Audio Counter Surveillance
Audio Modules
PA & Ambient Audio
Accessories
ConnectorsWire Connectors,Adaptors,Pigtails
Installation Tools & SuppliesTools,Wire,Hardware
Camera AccessoriesCamera Lenses,Bubbles & Cages

Keyboard ControllersKeyboard Joysticks,Keypads,Keyboards

Infrared IlluminatorsInvisible,Semi-covert,Standard,White LED
MountsCamera Brackets,Illuminators,Mobile,Monitors
Lens AccessoriesLens Cleaning,Lens Rings,Extension Tubes
EnclosuresCamera housings,Door Stations
PTZ ScannersIndoor,Outdoor
POS Integration