The FIRST ALERT (SA3210) Dual Sensor Smoke and Fire Alarm with a Built-In 10-Year Battery. White version.

Features:

• Power Source: Battery Operated 
• Battery Type: 10 Year Sealed Lithium
• Sensor: Photoelectric and Ionization
• Optipath 360° Technology: Patented technology provides 360° of direct access to the smoke sensor
• Intelligent Sensing Technology: Helps reduce nuisance alarms
• Noise Output: 85 dB in a T3 Pattern
• Single Button: One press to silence and test alarm
• Perfect Mount: Mounting bracket keeps alarm secure over a wide rotation range to allow for perfect alignment.
• Tamper Resistant: Includes Locking Pins
• Standards: UL 217