on the back there should be a number like +/- obs ft % or a sensitivity range could you please read the numbers form me please thank you

SMOKE SENSITIVITY: 1.18 to 2.83 %/FT. OBS.

I have 20 year old First Alert alarms with incompatible wiring. Does this unit come with a new wiring harness to connect to the AC line?

Yes, this comes with a 3 wire harness that gets hard wired to your existing electrical and connects to the back of the fire alarm. Black and white for power and red to link alarms together. It does not include any adapters so you will need to disconnect the power and replace the existing harness with the one included with the alarm.

The photo for this product indicates that this is a dual alarm (both p and i are shown on front of unit). Just supposed to be just photoelectric??

Yep, they are showing the wrong picture. This is a photoelectric model only. The dual ion/photoelectric hardwire detector is BRK 3120B. I realize your question is old....I'm answering it for others...

In two places, the description says this unit is red plastic. Is this true?

They are white with a red plastic dust cover. The red plastic dust cover is for use when you are painting or remodeling to prevent particulates from entering alarm and setting it off.

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First Alert BRK 7010B Hardwired Smoke Detector with Photoelectric Sensor and Battery Backup , White

Product ID: 6986772

Details

Brand
FIRST ALERT
Style
Hardwired
Power Source
Battery
Color
White
Product Dimensions
5.13"D x x
Alarm
Audible

⚡120V hardwired power

🔊85dB loud alarm

🔋9V battery backup

Description

🔥 Stay ahead of danger with smart, silent protection ⚡

SMART INTERCONNECT - Seamlessly links with other First Alert and BRK alarms for whole-home alert synchronization.
TRUSTED DURABILITY - Backed by a 10-year limited warranty and UL 217 certification for long-lasting peace of mind.
UNINTERRUPTED SAFETY - Hardwired with 9V battery backup ensures your home stays protected even during power outages.
USER FRIENDLY CONTROL - Silence/test button and intuitive alarm indicator make maintenance effortless and clear.
PHOTOELECTRIC PRECISION - Advanced sensor technology detects slow, smoldering fires faster than traditional alarms.

The First Alert BRK 7010B is a 120V hardwired smoke detector featuring a photoelectric sensor and 9V battery backup for continuous protection. It delivers an 85-decibel alarm and interconnects with compatible First Alert and BRK devices. Designed for easy installation and maintenance, it includes a silence/test button and an intuitive alarm indicator. Certified to UL 217 standards and backed by a 10-year limited warranty, it offers reliable, long-term fire safety.

Specifications

Brand	FIRST ALERT
Style	Hardwired
Power Source	Battery Powered
Color	White
Product Dimensions	5.13"D x 5.13"W x 5.13"H
Alarm	Audible
Sensor Type	Photoelectric
Global Trade Identification Number	00029054112019
Number of Items	1
Manufacturer	BRK Brands
UPC	029054112019 746211141193
Part Number	GID-601061
Item Weight	10.2 ounces
Item model number	7010B
Batteries	1 D batteries required. (included)
Is Discontinued By Manufacturer	No
Size	1 pack
Pattern	Smoke Detector
Thickness	11 Inches
Item Package Quantity	1
Number Of Pieces	1
Included Components	First Alert - 7010B
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Description Pile	9V
Warranty Description	Warranty
National Stock Number	6350-01-527-2316

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