Gentex CO1209F 120VAC 9VDC Single, Multiple Station Carbon Monoxide Alarm, Form A/C Relay
Visonic Wireless CO Detector (Express E Kit)
Amazon.com: Synergy Digital Alarm System Battery, Compatible with Visonic 2XER18505M Alarm System, (Li-SOCl2, 3.6V, 16000mAh) Ultra High Capacity, Replacement for DSC 2XER18505M Battery : Electronics