12/24VDC Latching Smoke Detector with Base. Contacts material is highly acid-resistant and rust-resistant. Twin-color LED display enables viewer to easily identify the current status of detector. Detector is made of high endurance, solid and colorfast Fire-proof plastic. Non-loosening screws on base terminal for easy installation. Detector has passed strict EMC test, which greatly eliminates false alarms caused by interference from nearby sources.