1、Plug and play, self-detection, sound and light alarm, to prevent poisoning. 2、Intelligent chip control, not cross-infected with other non-flammable gases. 3、It can detect natural gas, city gas, and liquefied petroleum gas. 4、When the alarm concentration is reached, the sound and light are linked. 5、Patented design, stylish and beautiful. Can be used independently or in conjunction with the control system. Features: Intelligent chip control, not cross-infected with other non-flammable gases. It can detect natural gas, city gas, and liquefied petroleum gas. When the alarm concentration is reached, the sound and light are linked. Patented design, stylish and beautiful. Can be used independently or in conjunction with the control system. Built-in speaker for independent on-site alarm. The alarm is suitable for security applications in home, office, shopping and other places. Specifications: Condition: Brand New Material: ABS Color: White Size: Approx.8*3.5cm/3.1*1.4in Weight: Approx.120g/4.2oz Package List: 1 * Smoke Alarm (Built-in Manual)