These parts added to your transmitter will give extended range with your Syma X5C and other 2.4GHZ quadcopter/boat/car/aircraft transmitters. Look on YouTube for 'Syma X5C antenna mod' before you buy to make sure you have the skills to complete this modification. There are a few ways to do it and pay special attention to where each of the two wires are soldered onto the small antenna board! Wire color/type may be different than shown in photos. The last photo shows what the coax will look like when you strip it. EASY to do and you will be happy with the result (looks cool too!) Thanks for looking!