The Kidde 20SAR is a hardwired DETECT-line smoke alarm with AA battery backup. Enhanced photoelectric sensing reduces false alarms from cooking while delivering fast detection. Hardwired interconnect ensures all alarms sound when one detects smoke. Self-testing internal components monitor operation continuously. Replace the AA batteries every 6 months or when the low battery chirp sounds. The twist-and-click mounting bracket simplifies installation.
How does the 20SAR interconnect with other alarms?
The 20SAR uses hardwired interconnect through the three-wire system. When any connected Kidde alarm detects smoke or CO, all interconnected alarms sound simultaneously. Up to 24 compatible devices (18 initiating) can be connected on the same circuit.
How often should I replace the AA batteries in the 20SAR?
Replace the 2 AA batteries every 6 months or when the low battery warning chirp sounds. The AA batteries serve as backup power during electrical outages, so keeping them fresh ensures continuous protection.
Does the 20SAR have DETECT-line enhanced sensing?
Yes. The 20SAR uses the DETECT-line photoelectric sensor with enhanced sensing technology that reduces false alarms from cooking — a significant improvement over older ionization-only models.
Does the 20SAR include self-testing?
Yes. Internal components continuously self-test to ensure the alarm is always ready to respond. Additionally, press the test button monthly to verify the horn and electronics work correctly.
What is the difference between the 20SAR and the 20SA10?
The 20SAR uses replaceable AA batteries that need changing every 6 months, while the 20SA10 has a 10-year sealed battery requiring no replacements. For convenience and eliminating battery maintenance, the 20SA10 is the premium choice.
# Kidde DETECT Smoke Alarm, Hardwired with AA Backup Battery **Model:** `20SAR` **Brand:** Kidde **Category:** Smoke Alarm Hardwired > The Kidde 20SAR is a hardwired DETECT-line smoke alarm with AA battery backup. Enhanced photoelectric sensing reduces false alarms from cooking while delivering fast detection. Hardwired interconnect ensures all alarms sound when one detects smoke. Self-testing internal components monitor operation continuously. Replace the AA batteries every 6 months or when the low battery chirp sounds. The twist-and-click mounting bracket simplifies installation. ## Specifications | Attribute | Value | |---|---| | Product Type | Smoke Alarm | | Alarm Type | smoke | | Sensor Smoke | photoelectric | | Power Source | hardwired-ac | | Voltage | 120 | | Battery Backup | Yes | | Battery Type | 2 AA | | Battery Replaceable | Yes | | Voice Alerts | No | | Smart Wifi | No | | App Connected | No | | Ring Ecosystem | No | | Interconnect | Yes | | Interconnect Type | hardwired | | Wire Free Rf | No | | Max Interconnect Devices | 24 | | Max Initiating Devices | 18 | | Self Testing | Yes | | Hush Feature | No | | Smart Hush | No | | Strobe | No | | Egress Light | No | | Alarm Db | 85 | | Ul Smoke | UL 217 | | Warranty Years | 10 | ## What's Included - alarm unit - 2 AA batteries - twist-and-click mounting bracket - wiring harness - quick install guide Source: https://www.jaspecs.com/kidde/smoke-alarm-hardwired/20sar-kidde-detect-hardwired-aa-battery-smoke-alarm/