Must have safety devices with sensors to detect a gas leak, opening window, unlocked door as well as motion in or outside of your house or office. Works with Google Assistant, Amazon Alexa, and mobile devices. 
     https://smartlivingandtechnology.com/collections/safety-and-sensors
Are you still using the old gas detector in your house? Upgrade the smart safety sensor device for your entire house or office for peace of mind. Monitored 24/7 from a wifi-connected device.