Gas Alarm COSMOS XW-715S with automatic test function ■ Product: XW-715S ■ Detection Principle: City Gas: Hot-wire semiconductor type CO Gas: Hot-wire semiconductor type Fire: Smoke detection method (photoelectric type) ■ Target Gases: City gas (12A, 13A gas, lighter than air) / CO ■ External Dimensions: W85 x H125 x D43.5mm (excluding protrusions) ■ Weight: Approximately 290g ■ Manufacturer: New Cosmos Electric ■ Expiration Date: March 2029 ■ Purchased from the gas company in 2023. For sale as it is no longer needed. ■ Instruction manual included. ■ After power is turned on, the normal lamp (green) lights up. ■ Usable until 2029, so it's a great value for those who are currently leasing one monthly.