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.
Odorless. Natural gas is odorless in its natural form. Before it arrives at your home, an odorant called mercaptan is added to it, so you can smell the gas immediately if a leak occurs. Mercaptan makes the gas smell like sulfur or rotten eggs. Everyone in your family should learn to recognize this smell.