Feature: 1. [Object Of Use] The fire alarm has built in high quality sensor, which can detect gas, natural gas, liquefied petroleum gas and other combustible gases, and detects many objects. 2. [Automatic Alarm] When the smoke alarm detects the smoke leakage concentration reaches 8% LEL, the alarm is triggered, the indicator light is red and the buzzer sounds sharply. 3. [Mesh Window Structure] The detector adopts mesh window structure, which is effective against dust and mosquitoes, and has stronger resistance to external interference and longer use. 4. [Durable] The fire alarm is made of hard ABS material, which can accurately send out an alarm even when it encounters an unexpected situation, and automatically reset to normal working state after the alarm is removed. 5. [Application Places] Smoke detector can be applied to a variety of places to detect: families, restaurants, gas stations, liquefied gas and LPG stations, sewage treatment plants, boiler rooms, etc. Specification: Item Type: Smoke Alarm Material: ABS Gross Weight: Approx. 145g/5.1oz Product Size: Diameter Approx. 104x51mm/4.1x2.0in Working Voltage: DC12-24V Alarm Indicator: Red LED Light is Always On (3m/9.8ft Directly in Front) Sound Pressure Range: 70dB (1m/3.3ft Directly in Front) Alarm Response Time: