The EL-2662 is a gas alarm with an integrated transmitter designed for use with Electronics Line 3000's supervised wireless range of receivers. On detecting the presence of gas, the unit sounds an alarm and notifies the control panel. The gas alarm has been designed to detect and provide early warning of the presence of natural (methane) and LP (propane, butane) gases. The gas sensor has been calibrated to detect these combustible gases at concentrations below 15% of the L.E.L (Lower Explosive Limit) - the level at which an air-gas mixture becomes explosive. Methane has an L.E.L. of 3.8%. Propane 2.1% and Butane 1.69%. (Source: UL 1484 Standard for Safety - Residential Gas Detector). The sensor detects methane at concentrations in excess of 0.5% and propane/butane at concentrations in excess of 0.503%.
Features

• Detects leaks of methane, propane and butane
• Alarm sounds when gas detected above calibrated threshold
• Alarm stops automatically when gas level drops below calibrated level
• No wiring or adjustment required
• Warning signal indicates sensor malfunction

More details online:

• You can expand this system, to have more functions and to be more suitable for other needs(detecting smoke, medical panic button for an older person). You can also connect your phone system to communicate whether an intruder came in or your elderly relative is in need of help.
• Monitoring the system - either personal or professional monitoring, or adding the home automation option;
• Read more about the INF-GAS Wireless Gas Detector on the Infinite Prime Wireless Alarms Presentation website.