Designed for the fastest possible installation! If AC power fails, the battery back-up keeps the smoke alarm working. Can be interconnected with up to 11 additional smoke alarms and 6 compatible devices like bells, repeaters or switches.

Note: This item is the DIRECT replacement for the discontinued BRK 4120, 4120B, and 86RAC

Additional Information :
Download Data Sheet Here
Download Manual Here

• Ionization Sensor
• Quick Plug-In Power Connector
• 120 VAC; Interconnectable
• Alarm Indication
• Battery Drawer Lock
• Mounting Bracket Lock
• Swing-Open Battery Door
• Battery Activation Tab
• Battery Back-Up
• AC Power Indicator
• Low Battery Warning "Chirp"
• Missing Battery Tab
• Easy Install Mounting Bracket
• 9V Battery Included

• 120V AC
• Alarm Dimensions: 5.6" dia x 2.0" H
• Weight: 7.8 oz (9120B)
• Operating Voltage: 120V AC 60Hz w/ 9V battery backup
• Operating Current: .04 amps (standby/alarm)
• Temperature Range: 40 Degree F (4 Degree C) to 100 Degree F (38 Degree C)
• Humidity Range: 10 percent to 90 percent relative humidity (RH)
• Audio Alarm: 85dB at 10 feet

Westside Wholesale is proud to offer "SAME DAY SHIPPING" on the above item if ordered before 4:00pm PST, Mon-Fri.

If the blue "QuickShip" icon does not appear above, it means that the product is most likely "on backorder" and will ship once it gets back in stock. (For large orders that require Freight or LTL Delivery, orders must be placed before 2:00pm PST).

"Same Day Shipping" means that the qualifying order will leave our warehouse the Same Business Day!

The estimated time of arrival for an order depends on the shipping method selected during checkout.

If Ground shipping is selected on an order that applies for "Same Day Shipping", the order will ship out the same afternoon & will take anywhere from 2-5 business days, depending where the items are being shipped. Click Here for Details

Orders that are over $149 and applicable for "Same Day Shipping", will leave our warehouse the Same Day with Free Ground Shipping!

If an order is in stock and qualifies for same day shipping, but is placed after 4pm PST, during the weekend, or on a recognized holiday, it will be shipped the following business day. If an item(s) in an order is not in stock or the quantity ordered is not available, the entire or part of the order may be held until the item returns back in stock, then the order will be shipped immediately.

10 year warranty through the manufacturer