What alarm do you have? Start with what you can see.
The brand, front wording and existing paperwork can help identify an alarm family. You do not need to take a device down to begin. Similar-looking alarms may have different sensors, backup batteries and connection features.
Residential alarm replacement. Defined work can be estimated; unknown-fault investigation is a separate scope.
01 / Identify Your Alarm
Identify without taking anything apart.
Use information that is already safely visible or recorded: the brand on the front, smoke/CO wording, a visible model identifier, an old invoice or the instruction booklet. Leave the alarm installed. Do not remove its cover, twist it off, touch wiring or test live equipment to prepare.
An exterior photograph may narrow identification. It cannot establish the wiring, internal condition, remaining service life, code compliance or whether the home is safe. If the needed label is hidden, a professional can document it during the visit.
SMOKE
Front wording can identify a detection category, not every internal feature.
SMOKE + CO
Look for explicit CO wording or documentation; do not infer it from the housing.
MODEL / DATE
Record only information already visible or documented. Hidden labels can wait for a professional.
Based on a smoke-alarm outreach photograph courtesy of U.S. Fire Administration. Uniform colors adjusted for this illustration; not a Mister Safety service visit or a current-model identification image.
02 / Identify Your Alarm
A brand name is only the beginning.
Retain every letter and suffix in the model number. For example, a voice, AC, wireless or battery variant can have a different role even when the housing looks familiar. Compare paperwork to the actual device; an old receipt is useful history, not proof that every alarm was replaced.
A manufacture date and an installation date are different records. Yellowing can prompt an age check, but color by itself is not an expiration date or a diagnosis.
Information to record · conceptual example, not a product label
Brand + exact model
Keep every letter, number and suffix.
Manufactured
The date the alarm was made.
Installed / activated
A separate date, if it was recorded.
Manual / records
Match the paperwork to the actual model.
This original graphic does not depict a real manufacturer label. Do not take an installed alarm down to fill it in.
Search the documented examples below by model, brand or detection type. These text-led cards avoid guessing a model from a lookalike photo. A match here is a reference to manufacturer information, not approval of a replacement or confirmation of safety.
13 documented model examples. This is not a compatibility or safety result.
KiddeSmoke
20SAR
120-V AC + 2 replaceable AA backup batteries
Sensing
Photoelectric smoke
Connection
Listed hardwire interconnect
Details and manufacturer references
Smoke-only sensing. Remote CO announcement is a separate, exact-model compatibility question.
The manual separates local battery alarm operation from Wi-Fi availability without AC. Optional app/monitoring services are not an included installation promise.
Official notices identify particular models and sometimes manufacture dates or printed markings. A concern about one generation does not apply automatically to every alarm with the same brand.
Keep the alarm in place while obtaining appropriate help. Follow the exact official notice and its current remedy; notices do not all give the same instructions. If an alarm is sounding or an emergency is suspected, follow the evacuation guidance above first.
The front of the alarm is like the cover of a book: it gives useful clues, but it may not contain all the details. Two covers that look alike can describe different products. That is why an exact model number is more useful than “the round white Kidde one.”
You are not expected to reach a hidden label or work out how the wiring is connected. Start with a list of rooms and whatever information is already easy to read. Leaving a field unknown is better than guessing.
Photos and paperwork help a conversation; they are not a safety inspection. An electrician can confirm the hidden information and compare the whole installation before recommending a replacement. A successful visual match should never become a green “safe” result.
Your questions, answered.
Does yellow plastic mean the alarm has expired?
Not by itself. The model, documented dates, condition and manufacturer instructions are more useful than color.
Should I take the alarm down for a label photo?
No. Provide only safely accessible exterior information or records you already have. A professional can document a hidden label.
What if I cannot find the model number?
You can still inquire. Tell us the rooms involved and any visible brand or smoke/CO wording; leave the rest unknown.
Share any alarm wording or model information you already have, and tell us which rooms you are considering. Unknown details can be discussed at the visit.
A replacement estimate or a diagnostic visit?
A free estimate prices defined replacement work. Finding an unknown fault or providing a broader assessment may have a charge. The scope and any charge are explained and approved before paid work begins.
Sources reviewed September 11, 2026. Educational guidance for residential alarm planning. Exact manufacturer instructions, installation conditions and applicable project requirements govern. Product examples are not a compatibility approval or a complete recall check.
