Universal Security Instruments Brand

Universal Security Instruments MCND401 M Series Plug-In Carbon Monoxide and Natural Gas Alarm with 9-Volt Battery Backup $49.99 B006W4TFDG
Universal Security Instruments M Series Plug-In Carbon Monoxide and Natural Gas Alarm with 9 -Volt Battery Backup, Model MCND401B $61.96 B006W4TFGS