Isafenest LZ-1921 Stand-Alone Smoke Detector.

Here is a brief breakdown of its key features and specifications:

Core Features

• Sensor Type: Uses a photoelectric sensor to detect smoke.
• Battery Power: Equipped with a 10-year built-in lithium battery (sealed, non-replaceable).
• Alarm: Produces a 85dB audible alarm at 10 feet, accompanied by a visual alert indication.
• Control: Features a single "Test & Hush" button to manually test the device or silence it during a false alarm.
• Alerts: Includes a low-battery warning signal.
• Certifications: LPCB certified, meeting EN14604:2005 standards.

Technical Specifications

• Operating Voltage: 3V
• Hush Duration: 8 to 9 minutes
• Interconnect: No (this is a standalone unit that does not link to other alarms)
• Operating Temperature: -10°C to +55°C
• Humidity Range: 10% to 95% RH