Calculator Based Ranger System 2... If You Teach Math, Physical Science Or Physics, You May Want To Consider The Cbr 2. The Cbr 2 Collects Distance, Velocity And Acceleration Data While Connected Directly To A Ti Calculator. The Connection To The Calculator Is Through The Calculator Link Port Or, If You Have A Ti84 Plus Or Ti84 Plus Silver Edition, The Cbr 2 Can Connect To The Calculator'S Usb Port. When The Cbr 2 Is Connected To The Usb Port Of The Ti84 Plus, The Easydata Application Automatically Starts And You Are Ready To Collect Data.