Dear Paul It seems to be a type of smoke detector with a wifi board in it. http://store.specksensor.com/products/speck Regards Crispin -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20150610/c04818fc/attachment.html>