This vintage auto sonic mark 30 a alarm is thermostatically activated and temperature rated at 135 degrees. This was engineered for early fire warning. U.S. safety and engineering corporation California USA. Thank you for viewing. *****THE FINE PRINT***** All of my items come from a smoke free home. If you have any questions or concerns, or would like to see more specific pictures, please feel free to email me. International Buyers: We only ship using the International Shipping Program on eligible items. I offer no warranty either expressed or implied. I pride myself on being completely honest in my descriptions but understand that my opinion on condition and quality may differ from yours. So, if you have any concerns… PLEASE ASK ALL QUESTIONS BEFORE offerDING OR BUYING! Payment is expected within 3 days of invoice. If payment is not received within 3 days, the item will either be re-listed or offered to another buyer and a case will be opened with . If you need additional time, please let me know before the sale ends so we can make arrangements. I am reasonable and easy to work with! Shipping: I do not include shipping in my item price so shipping is always a separate price. If this price is negotiated it will come from item price and not shipping cost. Shipping charges include delivery confirmation! The tracking number will be added automatically to the listing once your item is shipped! I usually ship within 24 hours of cleared payment. I do not, however, ship on Saturday or Sunday. Since I only accept Paypal as payment, I follow the Paypal shipping policies and only ship to a confirmed address. All items will be protected and packaged well. I take great care in packing so as not to incur any damage during shipping! Froo | Froo Cross Sell, Free Cross Sell, Cross promote, Marketing, listing Apps, Apps, Application

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