Audience response system with batteryless response units

A wireless response system, comprising:

• a base station and a plurality of response units, said response units wirelessly communicating with said base station in order to retrieve user responses received by said response units;
• each of said response units having a user input device that is adapted to receiving user input selections, a controller that is responsive to said user input device to process user inputs and to communicate responses wirelessly to said base station and a power supply that is adapted to supply power to operate said controller;
• wherein said power supply comprises a super capacitor and a wireless-charging circuit that is adapted to charge said super capacitor;
• wherein said wireless-charging circuit is adapted to supply a current to charge said super capacitor and wherein said power supply or said controller is configured to control the current that is drawn from said super capacitor.