Some schools have different versions of the CPS system. If your school has Generation 2 CPS remotes (shown here on the left) and Generation 2 Pulse CPS remotes (shown here on the right) , you can combine them to use with a large group of people. You are only going to use one RF receiver. Now you might think that you would use the newer Pulse RF receiver, but no. Plug in the Generation 2 RF receiver in the USB drive of your computer to receive the signals from the remotes. The next thing you will have to do is change the channel and the clicker # of the Pulse remotes. Plug the Generation 2 RF receiver in the computer. Wait for a few minutes to let the computer and the Device Manager recognize the RF receiver. Click on the Device Manager in the system tray and choose eInstruction Device Manager. Right click on the icon for the CPS Generation 2 and choose properties. The base channel the RF receiver is using will be listed on the general tab in the lower left portion of the window. Write this down. Now you will have to turn on every Pulse remote and change the channel and clicker number. To do this, press the left and right arrow keys together, and immediately press the + - sign button. Enter the new channel number and press the return key, enter the new clicker number (33 instead of 1 for example) and press return twice. This will turn the remote off and store the new information. It is a good idea to tape a piece of masking tape on the top of the remote with the new remote number so that you can keep track of them. I hope this helps.