GENTEX CORP 918-0005-002 GN-503 Combination Photoelectric Smoke and Carbon Monoxide Alarm, Single/Multiple Station, 120 Volt AC, 0.45 Ampere, 60 Hertz, 6.25" Diameter x 1.8" Depth, With 9 Volt DC Alkaline Battery

Features

• Relay Contacts Operate on Battery Back-Up
• Push Button Self-Test Feature
• Push Button Functional Test Feature
• Quick-Disconnect Wiring Harness
• Non-Latching (Self-Restoring) Alarm
• Fully Insect Protected
• Red LED Pulses Every 30 Seconds, Green LED for ACer On
• Mounting Hardware Adapts to Standard Junction Boxes, Including but Not Limited to 4 X 4 X 2-1/8 Octagon
• Dust Cover to Prevent Contamination During Installation
• Low or Missing Battery Indicator