If you are having trouble using the little button on your transmitter, here is a cure I've been using for years. Cut a small piece of plastic ( coke bottle etc. ) just big enough to cover the button. ( About 1/2 " X 1/2 " ) Then take a piece of ( good ) tape and tape the plastic over the switch ( like a flap ). This trick makes it a lot easier to use the switch and if you are an older instructor it really helps when the button imprints into your thumb and you loose contact and don't notice it instantly. Now ask me how and why I came up with this cure . lol ENJOY !!! RED