Amazon [amazon.com] has
Kidde Hardwired Smoke Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable, LED Warning Light Indicators, 20SA10-V on sale for
$34.70.
This product is typically listed around $40+. This is the lowest price ever seen on Amazon.
Details:- Brand: Kidde
- Style: 9th Edition
- Power Source: Hardwired
- Color: White
- Product Dimensions: 1.88"D x 5"W x 5"H
- Item Weight: 0.6 Pounds
- Alarm: Smoke Detector
- Operating Humidity: 10 to 95% (No Condensation)
- Sensor Type: Photoelectric
Features:- DETECTS SMOKE: Sounds a loud 85-decibel alarm when smoke is detected - 3 long beeps with red LED light flashing in time, repeating.
- HARDWIRED and 10-YEAR BATTERY BACKUP: Operates on 120V AC wiring (installed in the ceiling). No battery changes for 10 years and saves up to 40 Dollar over the life of the detector.
- ENHANCED SENSING TECHNOLOGY: Reduces false alarms often caused by cooking. Comprehensively tested to meet the latest UL standards, meets UL 217 9th Edition and FCC standards.
- VOICE ALERTS: Crystal-clear voice alerts tell you exactly why your alarm is sounding so you can react quickly.
- INTERCONNECT CAPABILITY: When one alarm sounds, they all sound, so you can get out faster. (Different models offer different interconnection options and requirements. See User Guide for more info.)
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With this sale, this model 20SA10-V [amazon.com] is $3 cheaper than the 20SA10 [amazon.com] ($37.79) that lacks the voice option. So if you need just one or two, this is a great deal. However, if you need three or four of these, the 20SA10 drops to as low as $30.69 per unit. Since this device will last 10 years, you may very well find it worth it to spend an extra $3-$4 per device to get the voice feature.
My house has three detectors in the hallways that I'm going to replace with units that also detect Carbon Monoxide [amazon.com]. I'll then use smoke-detector only units in the bedrooms.
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