Answered: two vex kits used at same time,help

i have 2 v-5 kits,i built 2 different bots ? how do i control both at the same time w 2 different people,when i try this the transmitters go nuts and control both of them ? what settings to have two robots in same room working w two seperate transmitters ??? thanks guys

The crystal is what determines the operating frequency and each robot must be operating on a different frequency; otherwise, you have interference and things go nuts. The main Kits all ship with the same frequency. To run multiple robots in the same area, you will need to purchase a Crystal Kit which will contain 4 different crystals. For more details, please refer to our Crystal Kit web page.