The First Alert (SA511B) eases the time, labor, and investment to retrofit hardwired alarms. Now with its patented OneLink technology, Wireless interconnect technology eliminates the need to pull wires through existing walls, saving you an average of between $150 - $200** per alarm when compared to retrofitting hardwired smoke alarms in existing walls or ceilings. First Alert, together with BRK brand alarms, continue to reinvest in the research and development of Smoke Alarm Safety Products.

**Note: Based on average retrofitting costs of time, material and labor to connect to existing alarm circuit, drywall repairs, painting, etc. Special cases that require conduit, wire mold, concrete drilling, etc. would add additional costs and increase savings.

Features:
- OneLink enabled alarm
- Exclusive voice alarm with programmable location; programmable with up to eleven locations
- Single button test/silence
- Two silence features: can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm
- RF Interconnect: reliable and secure radio frequency communication between alarms. 915 MHz frequency with 65,000 security codes and 3 channel frequency hopping
- Optipath 360 Technology: patented technology provides 360 degrees of direct access to the smoke sensor
- Perfect Mount: allows for easy alignment of alarm
- Spread Spectrum Horn Tone: lower and varying frequency makes it easier for the elderly with normal aged related hearing loss to hear the horn
- Latching Features: alarm latch - remembers which unit initiated an alarm
- Low Battery Latch: visually identifies unit in low battery condition
- 10-Years Limited Warranty Through the Manufacturer

Technical Specifications:
- Alarm Dimensions: 5" Dia. X 2" High
- Temp Range: 40° F (4° C) to 100° F (38° C)
- Audio Alarm: 85 decibel alarm
- Operating Voltage: Two 1.5V AA Batteries
- Humidity Range: 10% - 90% relative humidity (RH)
- Smoke Sensor: Photoelectric
- Operating Frequency: 915 MHz. FCC approved. Complies with Part 15 of the FCC Rules
- RF Linking: Automatic with 65,000 security codes
- Alarm Reset: Automatic when smoke clears
- Test/Silence Feature: Electronically simulates smoke condition
- Interconnections: Up to 18 units, RF or hardwired, with smoke, carbon monoxide, heat alarms and relays. Maximum 12 smoke alarms

Warranty: 10-Year Warranty Through the Manufacturer

OneLink Wireless Technology eliminates the need to pull wires through existing walls, saving time and money
Meets UL 217 standard: Single station smoke alarms
Listed with California State Fire Marshal
UL mandated repeating alarm horn pattern (85 dB)-3 beeps, pause, 3 beeps

Additional Information:
Manufacturer Specification Sheet (PDF File)
Manufacturer User Manual (PDF File)
Manufacturer Dimensions and Scale Drawings (JPEG File)