University of California, Riverside


Clicker Types and Receivers

 Clicker Types

Infrared Clicker
Radiofrequency Clicker #2
Infrared Clicker  
Radiofrequency Clicker #1
Radiofrequency Clicker #1  
   Radiofrequency Clicker #2

You can differentiate the older, more colorful infrared clickers from the similar radiofrequency clickers by looking at the front of each device, where the remotes emit their signals. Infrared clickers have three recessed bulbs inside, while the radiofrequency clickers have a flat surface. 


Infrared receivers handle fewer responses at once than the radiofrequency ones, and students must point more directly at them than at radiofrequency receivers for their responses to be recorded. If your student has an infrared clicker and is having difficulty, then there may be an issue with the infrared receiver in the room. Sometimes the infrared receivers have to be re-set in the classrooms, and the Multimedia technicians are the ones to do that. Contact Multimedia if you suspect a problem with the receivers in your classroom.

Keep the size of your classroom in mind when determining allowable time for response submissions. Radiofrequency receivers can only handle about 50-100 responses per second, and a response may not always register on the first attempt. After an attempt, there’s a lock-out period on a clicker of about 2 seconds, whereby students should wait for their clicker ID number to appear. To change their answer, they may need to wait up to 7 seconds to answer again. This information is in the Student FAQ section of this clicker support website under “Tips for Students: Clicker ‘lockout’ feature.” For suggestions on allowable time per questions, see the Clickers Knowledge Base topic on Instructional Strategies.



More Information 

General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

Department Information

Computer Support Group
Computing & Communications Bldg.

Tel: (951) 827-3555
Fax: (951) 827-4541