This gas sensor is built by a wireless signal transmitter and a special gas sensor, which is able to detect the most common gas like propane, butane, natural gas. The power supply is by 5V net power from an USB power adapter.
A backup battery can operate the gas sensor up to 12 hours, if net power is shut down.
The gas sensor is installed in a white-grey ABS plastic housing with a size of 8 x 5 x 3 cm ( 3,2 x 2.0 x 1.2 inch)
The wireless signal will be send locally directly on your Andorid smartphone (iphone app is in development) with a range up to 40 m ( 120 ft) in buildings and for long distance alarm to the DST- connector.