RF remotes generally work this way: The originating signal is sent from the remote as RF (radio frequency.) In the case of the MX-950 in my theater that's 418MHz, a very stable and reliable frequency band.
By nature, propane is clear and contains no scent at all. For safety purposes propane. companies add a substance known as ethyl-mercaptan to the propane fuel. Ethyl-. mercaptan has a strong rotten egg, or skunk-like scent, which allows the consumer to. smell it in the case of a leak.
*The propane odor may stick to the inside surfaces of gas piping distribution systems and other materials. Since there is a possibility of odor loss or problems with your sense of smell, you should respond immediately to even a faint odor or gas. Propane Gas Detectors Can Improve Safety.