Espire Optical Smoke Alarm Powered by Mains with a Replaceable 9V Battery. We take great pride in maintaining exceptional standards in our products. We are committed to harnessing the very latest technologies, & developing superior-performing products which allow installation projects to be completed quickly & easily. Supported by the esteemed Scolmore Group, a renowned leader in electrical & lighting solutions, Espire combines innovation, reliability, & the backing of a trusted industry partner.