Piotr Krzemiński have created a great android app which enables you to use your android smartphone as a remote control to start your sumo robot using the start module.
You will of course need a smartphone which includes an IR transmitter.
Search google play for sumoremote or follow the linkhttps://play.google.com/store/apps/details?id=eu.mcft.sumoremote
Fan page for the project: https://www.facebook.com/pages/Sumo-Remote/243607875842316